Uses & Effectiveness
Possibly Ineffective for
- Cold sores and fever blisters.
- Diaper rash.
- Minor burn or sunburn.
- Prickly heat.
Insufficient Evidence for
- Cancer.
- Swollen tonsils.
- Ingrown toenails.
- Poison ivy.
- Thinning gums.
- Sore throat.
- Other conditions.
Side Effects & Safety
Tannic acid is safe when used in the amounts found in foods.However, tannic acid seems UNSAFE when applied to the skin to treat diaper rash, prickly heat, and minor burn or sunburn. The US Food and Drug Administration (FDA) is worried that tannic acid might also be UNSAFE when used to treat cold sores and fever blisters on the lips. The concern is that the tannic acid might be easily absorbed through the lips and cause harmful side effects. But there isn’t enough research yet to know for sure. The FDA has asked for more studies.
In large amounts, tannic acid can cause side effects such as stomach irritation, nausea, vomiting, and liver damage. Regular consumption of herbs with high tannin concentrations seems to be associated with an increased chance of developing nose or throat cancer.
Special Precautions & Warnings:
Pregnancy and breast-feeding: It’s UNSAFE to apply tannic acid to broken skin or large areas of skin. There is concern that it might be absorbed and cause harmful side effects.The safety of taking tannic acid by mouth during pregnancy and breast-feeding is unknown. Stay on the safe side and avoid use.
Kidney problems: Tannic acid can cause kidney damage, making existing kidney problems worse. Don’t use tannic acid if you have a kidney disorder.
Liver problems: Tannic acid can cause liver damage, making existing liver problems worse. Don’t use tannic acid if you have a liver disorder.
Skin conditions: Don’t take a bath with added tannic acid if you have weeping eczema and extensive skin damage. The broken skin could allow too much tannic acid to get into your body.
Fever or infectious diseases: Don’t take a bath with added tannic acid if you have a fever or infectious disease.
Heart failure: Don’t take a bath with added tannic acid if you have heart failure.
Interactions
Major Interaction
Do not take this combination
-
Medications taken by mouth (Oral drugs) interacts with TANNIC ACID
Tannic acid absorbs substances in the stomach and intestines. Taking tannic acid along with medications taken by mouth can decrease how much medicine your body absorbs, and decrease the effectiveness of your medication. To prevent this interaction, take tannic acid at least one hour after medications you take by mouth.
Dosing
The appropriate dose of tannic acid depends on several factors such as the user's age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for tannic acid. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.
REFERENCES:
- Electronic Code of Federal Regulations. Title 21. Part 182 -- Substances Generally Recognized As Safe. Available at: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=182
- Covington TR, et al. Handbook of Nonprescription Drugs. 11th ed. Washington, DC: American Pharmaceutical Association, 1996.
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