chlorophyll

Chlorophyll is the natural pigment that makes plants green. Most products sold as "liquid chlorophyll" or chlorophyll tablets actually contain chlorophyllin, a water-soluble, semi-synthetic derivative made from chlorophyll. Chlorophyll occurs naturally in green plants and plant foods, and chlorophyll or chlorophyllin is also added to some cosmetics and dietary supplements.

No NIH Office of Dietary Supplements or NCCIH fact sheet exists for chlorophyll or chlorophyllin, and rigorous, high-quality human evidence for the popular wellness claims (detox, skin, weight, energy, body-odor) is limited and inconclusive. The uses listed above reflect how people use these products, not proven effects. Based on current authoritative US-government information, you should not expect chlorophyll or chlorophyllin to treat, cure, or prevent any disease.

No US-government recommended dose or established dietary requirement exists for chlorophyll or chlorophyllin, and the amount in commercial liquids and tablets varies widely from product to product. Because the evidence is limited and supplements are not tightly regulated, it is reasonable to talk with your doctor, pharmacist, or another qualified clinician before starting it — especially if you are pregnant, breastfeeding, have a medical condition, or take medications.

The MedlinePlus Medical Encyclopedia article on chlorophyll poisoning describes chlorophyll as relatively nonpoisonous, noting that most people who swallow it have no symptoms and that recovery is very likely. As with any supplement, use it only as directed, keep it out of reach of children, and stop and seek medical advice if you have an unusual or allergic reaction. Pregnant or breastfeeding people and those with health conditions should check with a clinician first.

Per the MedlinePlus chlorophyll poisoning article, possible effects after swallowing chlorophyll include diarrhea, looser or more frequent stools, and stomach cramps. It may also cause harmless discoloration — the tongue can look yellow or black, and urine or stool may appear green. When chlorophyll contacts the skin, it may cause mild burning or itching. These effects are generally mild.

No specific drug interactions are described in the cited US-government source, but that absence does not mean interactions are impossible. Separately, some forms of chlorophyll (chlorophyllin) may increase sensitivity to sunlight, so caution is reasonable if you take other medications that already cause photosensitivity. Because supplements can interact with medications, review all of your prescription drugs, over-the-counter medicines, and supplements with a pharmacist or doctor before use.