Sea Moss for Vegans: The Honest Mineral Gap Guide (Including the B12 Truth)

Vegan diets have real nutritional strengths — and real gap risks. Sea moss addresses several of the gaps. Let's be precise about which ones.

The Iodine Gap Most Vegans Miss

The primary iodine sources in standard Western diets are dairy (iodine from sanitizers and feed) and seafood — both excluded by vegans. Many "natural" and "artisan" salt brands are not iodized. Studies of vegan iodine intake routinely find median levels below 100 mcg/day, against an RDA of 150 mcg/day. Sea moss is one of the most concentrated plant-based iodine sources available: 200-400+ mcg per tablespoon. For most vegans, one tablespoon daily covers the iodine RDA entirely from a whole food source. Track total iodine if also using iodized salt.

Non-Heme Iron: What Vegans Need to Know

Vegans consume only non-heme iron. Non-heme iron absorption is 2-13% (vs 14-18% for heme iron from animal sources), and phytates in grains and legumes inhibit it further. Sea moss provides ~0.8-1.2mg non-heme iron per tablespoon — a meaningful dietary contribution when paired with vitamin C (which enhances non-heme iron absorption 2-3x). This is dietary support, not therapeutic supplementation for iron deficiency. Vegans should test serum ferritin annually — iron deficiency is common and treatable.

The B12 Reality

Sea moss does not provide bioavailable vitamin B12. Some seaweeds contain B12 analogs (pseudocobalamin) that bind to B12 receptors but don't function as coenzymes — they can actually interfere with true B12 metabolism. Anyone recommending sea moss as a B12 source for vegans is providing dangerous misinformation. Vegans need methylcobalamin or cyanocobalamin supplementation — 2,500 mcg weekly or 25-100 mcg daily — separate from sea moss. This is non-negotiable nutrition science.