Pomegranate health benefits, serving size and extract recipe summary

For ease of use, a summary of the links and information available about health benefits of pomegranate seeds, juice and peel; serving size information that is based on animal based research studies and my own use of different pomegranate ingredients; and a concise recipe for the pomegranate peel extract recipe that I’ve developed.

Health benefits of pomegranate:

Pomegranate extract has been studied in animal based research to examine in more detail how it helps hypertensive blood pressure problems and reduce oxidative stress. The mechanism was found to involve increasing Nrf2. The formation of mitochondria increased, and their function improved. Before treatment the hypertensive animals had fewer of the specialized proteins that are involved in production of mitochondria. Mitochondria are the cellular organelles primarily responsible for turning blood sugar/glucose into usable energy. (5)

This study uses a pomegranate extract that incorporates the peel, seeds and juice as all contain the bioactive phytonutrient, punicalagin, thought to be most helpful for anti-inflammatory, anti-tumor and anti-diabetic effects. The animals who received the extract were found to have better blood pressure, reduced heart hypertrophy ( a sign of worse heart health) and a lower heart rate. Neuronal/nerve cell activity and oxidative stress markers were decreased in the experimental treatment group compared to the control group which received a saline solution and no pomegranate extract. Angiotensin converting enzyme which is involved in blood pressure control was lower in the experimental group that received pomegranate extract and may be the mechanism for the lower blood pressure. Pro-inflammatory cytokines were reduced in the experimental group after treatment, an indication that hypertensive inflammation was reduced. The pomegranate extract treatment led to increased levels of phosphorylated AMPK which then leads to an increase in Nrf2 and its resulting increases in antioxidant proteins which protect against injury and inflammation from oxidative stress chemicals. (5)

Serving size that might be needed for general health or for special health needs:

Animal based research used a range of 1 – 10 grams/kilogram for 8 weeks was found to be beneficial for treatment of hepatocellular carcinoma (6); which for a human sized person might be equivalent to a a quarter to a half cup to a couple cups per day. (See this post for more details) The larger dose would likely be most beneficial used in smaller amounts throughout the day or in a couple portions. For example: Half a cup per day might be used for someone who is less ill and someone with more severe illness or genetic needs such as myself (I can’t make phospholipids and the pomegranate seeds and peel are a source) might use up to a half a cup every three to four hours throughout the hours spent awake – or whatever helped the symptoms. If every cell of the body needs the substances, every hour of the twenty-four, then one dose one time per day might leave the body under-treated for most of the 24 hours and only relieve symptoms for a few hours. The peel extract has a diuretic effect so using it earlier in the day and having a few extra glasses of water is mentioned in more detail later in this section.

I have found 1/3 to 1/2 cup of fresh seeds or pomegranate juice per day to help relieve my symptoms of anxiety and finger numbness (similar to Raynaud’s Disease but no diagnosis). Other patient forum feedback suggests one capsule of commercially available pomegranate juice concentrate was also helpful for Raynaud’s disease finger numbness or pain. (Avoiding letting the hands get too cold also can help prevent the condition from feeling as painful rather than just being a constant numbness in the fingertips.)

If I have pomegranate extract on hand I use a few tablespoons to about 1/3 cup per day and find it even more beneficial for relieving symptoms of anxiety or nerve numbness. However it has a diuretic effect so it is better to use it earlier in the day rather than at dinnertime and to have plenty of water or other water based beverages early in the day so sleep isn’t interrupted with a need to relieve the bladder. It is important to drink a little extra water or the urge to urinate can be painful and produce little flow. The body removes acidity by making a more concentrated urine – so add water yourself or a dilute juice or herbal tea and the kidneys will also be removing other toxins too which may increase health benefits.

Dried powdered pomegranate seeds are available at some India food grocery stores or websites look for a small box labeled Anardana. It seems to be a dried powder of the whole seeds and it is gritty and tart with a fruit flavor. I added a couple tablespoons to a batch of soup and that seemed to soften the gritty effect. It was good added after cooking, giving a nice tartness but there was a slight gritty texture occasionally, not too noticeable though. Anardana Powder, dried pomegranate seed powder – an example of the product is available online:

Yogijis.co.nz Phone: (03) 390 3434 Email: orders@yogijis.nz
Anardana Powder, Powder of Dried Pomegranate Seeds: net Wt. 100 g//3.5 oz for $3.99

An organic pomegranate juice concentrate is also available in the same quantity for a larger price. That seems like a lot of money for a 3.5 oz package which is slightly less than a half cup amount, unless you were comparing it to prepared capsules of a pomegranate product which might cost 20 to 30 dollars for one bottle of capsules:

Matakanasuperfoods.com, PO Box 18, Matakana 0948 New Zealand / Physical address: 108 Omaha Flats Rd. Auckland, New Zealand, Phone: 09 422 9618 Outside New Zealand: +64 9 422 9618
Organic Pomegranate Juice Powder, 100g, $NZ 29,95

Sumac and Za’atar

A spice commonly used in Middle Eastern cooking and readily available at Middle Eastern grocery market may provide some similar health benefits to pomegranate. It is a dried powdered form of Sumac that has a lemony flavor. it is typically sprinkled on food individually at the table alone or in a mix with salt or with a few other spices and sesame seeds in a mixture called za’atar (link). I have found that using more than a half teaspoon can cause the diuretic effect similar to the pomegranate extract’s effects. Studies on health benefits of Sumac have found benefit for a number of inflammatory conditions so using some in small amounts daily may have preventative health benefits against oxidative stress.

Pomegranate Extract Recipe and Spicy variation:

Pomegranate Extract, basic recipe:

Peel and inner membrane of two pomegranates
Two to three cups of water
Two Tablespoons of Coconut oil

Rinse the pomegranates before separating the seeds from the peel. Cutting the rind about a quarter inch deep in six sections can make it easier to open and remove the seeds. Save the juicy seeds for use fresh or place in a freezer container and store in the freezer for later use. Trim the peel to remove any spoiled or discolored spots on the outer peel or inner membranes. Discard. Rinse the remaining peel and chop into quarter to half inch sections.
In a soup or stock pot place the chopped peel, water and coconut oil and bring to a gentle simmer and turn down the heat to continue at a gentle simmer. Try not to reach a vigorous boiling point. Simmer the mixture for 20-30 minutes while stirring occasionally to prevent the fibrous slightly sweet membrane particles from sticking to the pan.
Remove from heat and strain the liquid into another large pan or bowl. The peel and membrane fiber is pulpy and can be rinsed with additional water to increase yield of the pulpy extract. Add one cup warm water and stir and strain the pulp and then add another one cup warm water, stir and strain, and maybe one or two more cups until the liquid seems more water like instead of a slightly thickened pale pinkish or creamy yellow color.
Store the pomegranate extract in the refridgerator if it will be used in other recipes within a few days or freeze the excess in small containers for gradual use.
It is very acidic and using a couple spoonfuls per day added to a soup or salad in place of lemon juice or vinegar can be a tasty way to use it. Diluting a few spoonfuls to 1/3 cup with an additional 2/3 cup of water or regular juice of some sort and adding a pinch of baking soda can make it tolerable as a beverage. One third cup per day should provide adequate health benefits for someone using it for that purpose.

Pomegranate Extract made with dehydrated pomegranate peel

Repeat the above steps using pomegranate peel and membrane that had been prepared and diced into 1/4-1/2 inch sections and dehydrated for long term storage – planning ahead for when pomegranates were no longer in season. One pomegranate peel/membrane produced approximately 30 grams of dried peel and which measured at slightly less than a 1/2 cup of dried pieces loosely packed. Per one pomegranate amount of peel, add one tablespoon of coconut oil and 2 cups of water, and simmer for 20-30 minutes on low heat. After straining the heated peel I rinsed the peel with two cups of water poured over it gradually while stirring. The yield was three cups of pomegranate extract.

Spicy Pomegranate Extract, Slightly less acidic and slightly thickened and emulsified Spicy:

6 cups of pomegranate extract (previous post)
2 Tablespoons Cardamom powdered spice
1 teaspoon Gumbo File powdered spice (Sassafras Leaves, powdered and used in Gumbo soups or stews in Creole style cooking)
1 teaspoon Baking Powder

Add the Cardamom and Gumbo File to the Pomegranate Extract and stir well to break apart any dry lumps of the powdered spices. The Gumbo File acts as an emulsifier and is a digestive aid and the Cardamom adds flavor, phytonutrients and would help alkalize the mixture in addition to the alkalizing power of the Baking Soda.
Bring the mixture to a boil.
Add the Baking Soda and stir. Remove the mixture from the heat and keep stirring. It will froth up and stirring helps keep it from frothing over the top of the pan. The color changes from pinkish to brown from the Cardamom spice.
To drink as a beverage dilute with equal parts water to Pomegranate Extract.

Disclaimer: Opinions are my own and the information is provided for educational purposes within the guidelines of fair use. While I am a Registered Dietitian this information is not intended to provide individual health guidance. Please see a health professional for individual health care purposes.

References:

Claude Prigent, Editor, Protein Phosphorylation, Publisher: InTech, Chapters published November 29, 2017 under CC BY 3.0 licenseInTechOpen.com, https://www.intechopen.com/books/protein-phosphorylation (4)
Wenyan Sun, Chunhong Yan, Bess Frost, Xin Wang, Chen Hou, Mengqi Zeng, Hongli Gao, Yuming Kang,and Jiankang Liu,
Pomegranate extract decreases oxidative stress and alleviates mitochondrial impairment by activating AMPK-Nrf2 in hypothalamic paraventricular nucleus of spontaneously hypertensive rats., Sci Rep. 2016; 6: 34246. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5054377/ (5)
Anupam Bishayee, Deepak Bhatia, Roslin J. Thoppil, Altaf S. Darvesh, Eviatar Nevo, and Ephraim P. Lansky., Pomegranate-mediated chemoprevention of experimental hepatocarcinogenesis involves Nrf2-regulated antioxidant mechanisms., Carcinogenesis. 2011 Jun; 32(6): 888–896. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3314278/ (6)

February 21, 2018

Sumac tea was a lemony drink used by Native Americans

Sumac is a shrubby tree that grows easily in many areas of the U.S. and other countries. Types with reddish berries/seed clusters are safe for tea or use as a ground spice while a type with whitish berries is not safe. As a plant it is considered an invasive species because it grows so easily it can be difficult to remove from an area. It grows wild in patches along highways in some areas such as Iowa for example:

Sumac growing wild along U.S. Highway I-80 in Iowa during the winter season. when no leaves are present but last years seed clusters can still be observed on the top branches

Why care about Sumac? I bought a jar at a Middle Eastern grocery store of the plant prepared as a ground dried spice to sprinkle on foods during cooking or at the table. The jar I bought was imported from Lebanon. I paid $3.99 for a little less than a half pound size container so it isn’t a high profit margin spice but on the other hand I would be happy to by Sumac that was harvested in Iowa or Oklahoma or Michigan – all places where it grows wild.

One species that is safe for use is known to grow in all 48 contiguous states. Early in the spring the newly sprouted shoots can be eaten as a salad like vegetable. the lemony flavored tea can also be made into a jelly or candy: (http://www.eattheweeds.com/sumac-more-than-just-native-lemonade/)

Research performed with the plant in other nations regarding its medicinal benefits have found the spice or extracts to have a wide range of benefits. More information about medicinal benefits are in an earlier post on the topic and are also listed with summertime images of the red seed clusters in an article Sumac: Nutritional Properties: https://iowaherbalist.com/tag/sumac-nutritional-properties/ and one about Sumac Tea: https://allnaturalideas.com/sumac-tea/.

The spice or tea can have significant diuretic properties similar to drinking coffee or alcoholic beverages so having smaller amounts earlier in the day along with plenty of water throughout the day can help the body cleanse toxins early in the day without waking you in the middle of the night. Overly acidic urine may cause an extreme urge to urinate but then produce only a small amount – which means the body is working hard to remove acidity without adequate water to dilute it – so drink plenty of water and acidity and toxins will be readily removed in the more dilute urine. Diuretic medications are often given to patients who are retaining excess water with a goal to help the body remove the excess water and salt from edematous areas between organs and outside of blood vessels. https://www.health.harvard.edu/heart-health/tips-for-taking-diuretic-medications They are different but similar in effect to a diuretic beverage such as coffee or alcoholic beverages.

The acidic and antimicrobial properties of sumac have also been studied in food preparation of raw chicken to reduce the risk of salmonella and other food pathogens: The Effect of Water Extract of Sumac (Rhus coriariaL.) and Lactic Acid on Decontamination and Shelf Life of Raw Broiler Wings, https://academic.oup.com/ps/article/85/8/1466/1524938

Gallotannins are one of the phytonutrients in sumac with medicinal benefits and is concentrated enough that the plant can be a source for extracting the substance, gallotannins and sumac. While the active phytonutrients in pomegranate peel extract and sumac extract are slightly different they both exhibit antifungal properties that may be beneficial for commercial, agricultural use: Chemical Characterization of Different Sumac and Pomegranate Extracts Effective against Botrytis cinerea Rots http://www.mdpi.com/1420-3049/20/7/11941/htm

To connect the dots for those who don’t see the bigger picture in the same way that I do – one easy to grow crop that grows across the nation could be used to flavor anything lemon flavored for possibly less cost that lemons cost. The lemon flavor is from the terpene content, it contains the same type as lemon and limes: limonene. Sumac could be used for a variety of products for direct use by humans and might also be useful as a medication for humans or for animals. It also might have industrial and agricultural uses for its antimicrobial and antifungal properties. One negative side effect that has become more apparent in agriculture is that pathogenic fungal strains seem more prevalent in soil that has had a buildup of Roundup/glyphosate. Hard to treat fungal illnesses in humans may also becoming more common. A lemony drink or food that treats hard to treat diseases in humans or farm animals and which can be grown very inexpensively could be useful if it was recognized as useful instead of simply an invasive weed.

The seed clusters left over from last fall could likely be harvested now, before spring growth occurs, and used for agricultural experiments this season, instead of waiting for the next new crop of seed clusters that would be ripe at the end of next summer, approximately in August.

The pomegranate peel leftover from making pomegranate juice is currently also being wasted when it might be useful as a medicine or food substance or even as an agricultural antifungal treatment.

February 18, 2018

Pomegranate extract – Master Chef Challenge update

For anyone following along with the pomegranate peel experiments (previous post)- update, I had a lot of pomegranate extract thawed at the same time and for a dietitian that means reheat to steaming to assure food safety. So it was an opportunity to experiment some more with trying to adjust the acidity again. When baking soda is added to a hot acidic liquid there is an obvious bubbling reaction and change in color of the liquid. I have pH strips to check acidity and did manage to adjust the acidity of the extract. The taste is still not great but chronic illness and mood issues are not great either. After three cups of experimental attempts my mood is awesome *(see additional note) and I have some recipe details:

6 cups of pomegranate extract (previous post)

2 Tablespoons Cardamom powdered spice

1 teaspoon Gumbo File powdered spice (Sassafras Leaves, powdered and used in Gumbo’s in Creole style cooking)

1 teaspoon Baking Powder

Add the Cardamom and Gumbo File to the Pomegranate Extract and stir well to break apart any dry lumps of the powdered spices. The Gumbo File acts as an emulsifier and is a digestive aid and the Cardamom adds flavor, phytonutrients and would help alkalize the mixture in addition to the alkalizing power of the Baking Soda.
Bring the mixture to a boil.
Add the Baking Soda and stir. Remove the mixture from the heat and keep stirring. It will froth up and stirring helps keep it from frothing over the top of the pan. The color changes from pinkish to brown from the Cardamom spice.
To drink as a beverage dilute with equal parts water to Pomegranate Extract.

This would be an acquired taste – aka “not good” until you get used to it, or not good at all but the mood and health benefits are worth for me at least. It is also a diuretic which means it is like beer or coffee in the way it increases kidney activity and urine production so it is best to have it earlier in the day followed by plenty of glasses of water early in the day so that you aren’t waking up in the middle of the night as much. Overly acidic, dehydrated body fluids can increase work for the kidneys and result in a frequent feeling of needing to go urgently but then not producing much quantity – drink plenty of water early in the day and produce plenty of dilute quantity early in the day and a diuretic can help cleanse toxins from the body instead of being a middle of the night problem.

Since pomegranate growing season is limited the powdered spice made from Sumac might be a health substitute. It has been shown to have a range of health benefits, and is also a diuretic. Its phytonutrients are similarly colored suggesting there might be some similar antioxidant content as well. The gallotannin group of phytonutrients are in common and would likely promote Nrf2. (More about Sumac in this post) (a series of posts on Nrf2)

To put a financial perspective on this – for my health needs the pomegranate extract or pomegranate seeds and cardamom powder and a few other good sources of phospholipids are adequate replacements for my medical marijuana which cost me around $1000-1200 per month. The medical effects are slightly different and not quite as good for pain killing properties but the negative psychological effects that can occur with withdrawal for some people are also not present.

To review – cannabinoids are a group of chemicals that are made within the cells of most species and are similar to the group of cannabinoids found in the cannabis plants commonly known as marijuana or hemp. Medical marijuana has a euphoria producing one known by the chemical initials THC while hemp has only non-euphoria producing cannabinoids. Both types can have medical or other basic health benefits. Cannabinoids are found throughout membranes and add to cell wall flexibility and help with messenger chemical type activities that can help reduce inflammation and fight infection. Some people such as myself can have genetic differences that make it impossible to make the chemicals internally as in average health. I have had minor health problems since infancy and having external dietary sources of phospholipids or cannabinoids helps my body and mood and immune system. More information about the topic is available in the post/article Is it Addiction or Starvation?

People with problems with binge eating disorders, alcohol abuse tendencies, meth or heroin/opioid abuse tendencies, or seem to have an excess use of marijuana, and nicotine to a lesser extent all may actually have underlying genetic differences that leave them in need of increased dietary sources of phospholipids/cannabinoids. The article Is It Addiction or Starvation? has some legal food sources in addition to pomegranate seeds and cardamom spice. It doesn’t mention the Middle Eastern spice Sumac but it might help also.

*Additional note – three cups was likely to large of a serving, an awesome mood for someone with unstable mood issues was too much of a good thing – Newton’s Law of Gravity may apply metaphorically, “What goes up must come down.” I had a worse mood problem later in the evening. Today (the next morning) I’ve enjoyed a few spoonfuls of the spicy, creamy slightly thickened mixture in my coffee and it is good to my “acquired taste.” The thing about having acquired an acquired taste for something is that you then want to acquire more – pun intended. The pomegranate season in Australia turns out to also be November to March so that isn’t much help. Processing pomegranate peel during the growing season would be necessary if I hope to continue to be able to acquire pomegranate extract all year long. It has medicinal benefits according to the research that is available, (see links in earlier posts on this site).

New Zealand isn’t ideal for pomegranate either as the summer length may be too short some years, however their harvest season is February-April: “Pomegranates grow best in areas with cold Winters and long hot, dry Summers.” (Pomegranate Wonderful)

February 2, 2018

For those who can’t grow pomegranates, consider sumac instead

Sumac is a shrub like tree or a tree like shrub that is an invasive plant in many areas. Types that have white berry clusters should be avoided as the white berries are poisonous but the types with clusters of red berry like seeds are safe to consume when made into a tea and they may be dried and ground into a spice. Native Americans use them in a lemonade like beverage and they are ground into a spice which is used in many Middle Eastern dishes and as a table condiment to sprinkle on foods to individual taste. The ground Sumac is mixed with salt or available plain in shaker bottles and is mixed with a few other spices in the blend called za’atar (sesame seed, salt, and thyme or hyssop).

Some of the phytonutrient content and medicinal properties of edible sumac are similar to those found in pomegranate and may be associated with the bright red pigmentation. The botanical name for Sumac , ‘Rhus,’ translated as a foreign word means ‘red.’ Some people may be allergic skin reactions from touching the plant in nature (1) and as a more concentrated tea it has diuretic properties, which can have health benefits to help remove toxins if plenty of additional water is also consumed to prevent dehydration. (2)

“Sumac is used medicinally in Arab countries. Studies on sumac extracts to date have indicated that the plant may be a source of bioproducts with the following bioactivities: antifibrogenic, antifungal, anti-inflammatory, antimalarial, antimicrobial, antimutagenic, antioxidant, antithrombin, antitumorigenic, antiviral, cytotoxic, hypoglycaemic and leukopenic (Rayne and Mazza, 2007).” (1)

The lemonade like flavor would be from the terpene limonene and possibly other terpenes found in the plant. Anthocyanins likely give it some of the bright color. It also contains tannins primarily in the form of gallotannins, which are similar to the elligatannins/ellagic acid found in pomegranate, (3), and other aldehydes and beneficial acids that give it tartness including vitamin C – ascorbic acid. (1) Eating a large enough amount on a regular basis may be important for the health benefits from phytonutrients. Research with elligatannins has found them helpful for cancer prevention and somewhat for treatment (4) but a recent study that used a small dose, 900 mg of pomegranate extract per day, found some changes in important genes but not conclusive health benefits. (5) Research on tumor inhibiting properties of sumac found it beneficial during early stages when the tumor is developing rather than as a treatment after it was formed (animal study). (6) Animal based trials in more recent research that found benefits using pomegranate extract used doses that would be equivalent to larger doses, 1 to 10 grams/kilogram body weight per day. The study and amounts used are discussed in this post and the link is in this earlier post. A beneficial substance that we have to make for ourselves, Nrf2 may be involved. Tannins, anthocyanins, and aldehydes were all mentioned as being helpful for helping promote our own body’s ability to produce more Nrf2. The gallic acid (related chemically to the gallotannins, the mango fruit is also a source (8)) is mentioned to help induce apoptosis in cancer cells (cell death) in an article discussing the role of oxidative stress in cancer treatment. (7)

“Gallic acid (3,4,5-trihydroxybenzoic acid, GA), a polyhydroxy phenolic compound, is abundant in natural plants such as gallnut, grapes, sumac, oak bark, green tea apple peels, grapes, strawberries, pineapples, bananas, lemons, and in red and white wine. Its antioxidative DNA-damage action has been well documented [122]. However, gallic acid induces apoptosis in several cancer cell lines by increasing ROS level and GSH depletion [123].” (7)

That excerpt is from a section titled: 5.1. Anticancer ROS-Generating Compounds from Natural Origin, (7), which also contains information on other phytonutrients and foods that contain them that have been found beneficial for preventing or treating cancer or reducing oxidative stress.

I bought some dried sumac prepared for table use but chose a brand without salt added to it so I could use as much as I want without having to be concerned about adding too much salt. The aroma and flavor are good and the color is very pretty, slightly more purplish than paprika but similar in the bright addition it makes when sprinkled on the surface of a food. It was $3.99 for a 9.33 ounce bottle at a Middle Eastern foods grocery store.

Phytonutrients with bright colors often seem to be associated with health benefits but that doesn’t mean all wild berries or plants are edible. Read guides and know what you’re harvesting before eating it – and avoid private property and nature preserves where it might be illegal to pick anything.

They are so common in some areas that I happen to have picture taken on a recent walk. A discussion with more detail and a close up image taken during late summer is available here: The ‘Lemonade Tree’: It’s Time to Harvest Sumac, EdibleEastEnd.com. (2)

Sumac – an overview, ScienceDirect Topics, sciencedirect.com, https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/sumac
Ronald Halweil, The ‘Lemonade Tree’: It’s Time to Harvest Sumac, Edible East End, August 9, 2012, EdibleEastEnd.com, https://www.edibleeastend.com/2012/08/09/harvest-sumac/
J. P. Perchellet, H. U. Gali, E. M. Perchellet, P. E. Laks, V. Bottari, R. W. Hemingway, and A. Scalbert, Antitumor-Promoting Effects of Gallotannins, Ellagitannins, and Flavonoids in Mouse Skin In Vivo,
Food Phytochemicals for Cancer Prevention, Chapter 25, pp 303–327

Chapter DOI: 10.1021/bk-1994-0546.ch025, ACS Symposium Series, Vol. 546, http://pubs.acs.org/doi/abs/10.1021/bk-1994-0546.ch025
Tariq Ismail, Cinzia Calcabrini, Anna Rita Diaz, Carmela Fimognari, Eleonora Turrini, Elena Catanzaro, Saeed Akhtar, and Piero Sestili,
Ellagitannins in Cancer Chemoprevention and Therapy. Toxins (Basel). 2016 May; 8(5): 151. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4885066/
Nuñez-Sánchez MA, González-Sarrías A, García-Villalba R,et al, Gene expression changes in colon tissues from colorectal cancer patients following the intake of an ellagitannin-containing pomegranate extract: a randomized clinical trial. J Nutr Biochem. 2017 Apr;42:126-133. doi: 10.1016/j.jnutbio.2017.01.014. Epub 2017 Jan 27. https://www.ncbi.nlm.nih.gov/pubmed/28183047
Perchellet, J.P., Gali, H.U.Perchellet, E.M.Laks, P.E.et al., Antitumor-promoting effects of gallotannins, ellagitannins, and flavonoids in mouse skin in vivo [1994], ACS symposium series, ISSN : 0097-6156, Source: Information Systems Division, National Agricultural Library, http://agris.fao.org/agris-search/search.do?recordID=US9602151
Giuseppina Barrera, Oxidative Stress and Lipid Peroxidation Products in Cancer Progression and Therapy., ISRN Oncol. 2012; 2012: 137289.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3483701/
Gallotannins, Science Direct, ScienceDirect.com, https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/gallotannins