Chlorella
Also known as: chlorella algae
Chlorella is a nutrient-dense microalga marketed as a supplement. Generally well-tolerated, though some products have been contaminated with heavy metals or microcystins.
What it is
A genus of single-celled green freshwater algae (Chlorella vulgaris, C. pyrenoidosa) used as a nutritional supplement.
Nutritional supplement; source of protein, chlorophyll, vitamins.
Why it's flagged
- potential heavy metal contamination
- vitamin K content (interacts with warfarin)
- GI distress
What regulators actually say
"Chlorella is a green freshwater algae rich in nutrients including protein, vitamins and minerals; safety data indicate generally good tolerance though contamination concerns exist."
"Foods that contain large amounts of vitamin K, such as green leafy vegetables and some algae, can interfere with warfarin."
Regulatory status
United States — FDA
Permitted as dietary supplement under DSHEA; not GRAS as conventional food additive
European Union — EFSA
Considered a traditional food in EU; novel food status varies by species
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