A common type of algae can actually fix Vitamin B12 deficiency, proving you don't just need meat for it.
In a 12-week trial, tablets made from Chlorella vulgaris quadrupled the vitamin B12 levels of deficient adults. This suggests that certain algae provide a bioavailable 'active' form of the vitamin, offering a genuine plant-based solution for a nutrient previously thought to be exclusive to animal products.
Assessing the efficacy of Chlorella vulgaris for Vitamin B12 Deficiency: A Randomized Controlled Trial
medRxiv · 10.64898/2026.03.16.26348496
Abstract: Context: Vitamin B12 deficiency is common among vegans and vegetarians due to limited intake of animal-derived foods. Identifying safe, plant-based sources of vitamin B12 is essential to address this nutritional gap. Aims: This study evaluated the efficacy and safety of Chlorella vulgaris tablets in improving vitamin B12 deficiency. Settings and Design: A double-blind, randomized, placebo-controlled trial was conducted among 46 healthy adults with vitamin B12 deficiency (serum levels 1