Note: only two species of Nori contain bioavailable B12: dried green laver ( Enteromorpha sp.) and purple laver ( Porphyra sp.) A 2014 article, on vegetarian nutrition, notes that most other forms of algae have only trace amounts, if any, B12: Dried green laver (Enteromorphasp.) and purple laver (Porphyra sp.) are the most widely consumed edible algae, and they contain substantial amounts of Vitamin B12 (approximately 63.6 g/100 g dry weight and 32.3 g/100 g dry weight, respectively)
A product can have a high chemical-purity figure and still present risks from contamination, endotoxins, aggregation, incorrect concentration, or unsuitable manufacturing conditions
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FDA scientists recommended against adding all seven to the compounding list, citing inadequate human trials and unresolved questions about contamination, immune reactions and dosing
B12 and B complex pills take a long time to absorb into your system
