Beta-Carotene vs Spirulina Extract: which is worse?

What is Beta-Carotene?

Beta-carotene is an orange pigment found abundantly in carrots, sweet potatoes, and leafy greens. As a food additive (E160a), it is used as a coloring agent providing yellow to orange hues. It also functions as a precursor to vitamin A in the body. Commercial beta-carotene used as a food additive can be extracted from algae (Dunaliella salina) or produced synthetically.

What is Spirulina Extract?

Spirulina extract is a blue-green color derived from the cyanobacterium Arthrospira platensis (spirulina). The active coloring compound is phycocyanin, a fluorescent blue protein-pigment complex. The FDA approved spirulina extract as a color additive for candies, confections, and chewing gum in 2013, making it a popular natural alternative to FD&C Blue No. 1.

Documented risks

Beta-Carotene: Beta-carotene from food is considered safe and beneficial. However, high-dose beta-carotene supplements (25 mg/day and above) were associated with increased lung cancer risk in two major clinical trials — ATBC (1994) and CARET (1996) — specifically in heavy smokers and asbestos-exposed workers. Food-level exposure from coloring use is far below supplemental doses. Harmless skin yellowing (carotenemia) can occur with very high dietary intake. As a food additive colorant, no significant safety concerns exist.

Spirulina Extract: Spirulina extract is safe at food coloring use levels. Spirulina as a supplement is generally well-tolerated; however, it can contain trace amounts of heavy metals and potentially hepatotoxic cyanotoxins if harvested from contaminated water bodies. Commercial food-grade spirulina extract is purified and subject to quality standards that minimize these risks. No adverse effects from spirulina-derived food coloring have been documented in peer-reviewed literature.