Short answer

We found no documented interaction between Chlorella and Vitamin C in the sources below. That isn't proof the combination is right for you: check each one's cautions, and ask your pharmacist if you take medication.

Chlorella

What it is: A green freshwater alga sold as a supplement.

What the research says: A review of 10 trials found modest drops in total and LDL cholesterol. Only 2 of those trials checked what the supplements actually contained.

Cautions

• That review didn't assess safety, and we didn't find a reliable safety review.

Medicines to check

• Talk to your clinician if you take any medicine

In Holitro: Chlorella (500 mg per capsule)

Source: PubMed review: Chlorella vulgaris and lipid profile: meta-analysis (2022) (updated March 2022)

Vitamin C

What it is: An antioxidant vitamin the body needs to make collagen, absorb iron from plant foods and support the immune system.

What the research says: Vitamin C is essential; supplements make sure you get enough if your diet falls short.

Cautions

• Adults shouldn't exceed 2,000 mg a day; too much can cause diarrhea, nausea and cramps.
• People with hemochromatosis should avoid high doses.

Medicines to check

• Chemotherapy and radiation: check with your care team first
• In one study, antioxidants including vitamin C reduced the benefit of a statin plus niacin

In Holitro: Vitamin C (1000 mg per capsule)

Source: NIH Office of Dietary Supplements: Vitamin C: Fact Sheet for Consumers (updated March 2021)

Check with your doctor or pharmacist, especially if you take medication.

Check your stack — free

Educational information only, not medical advice. This reflects general ingredient overlap, not a personalized safety review. Always check with your doctor or pharmacist before combining supplements, especially if you take medication, are pregnant or nursing, or manage a health condition. These statements have not been evaluated by the FDA.