j"19HxigV4QyBv3tHpQVcUEQyq1pzZVdoAutLæ@77 B12 comes in two forms: protein-bound B12 (from animals) vs crystalline or "free" B12. Before it can be absorbed into our systems we must detach vitamin from protein and that can cause levels to be much less than anticipated.
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https://whatsonchain.com/tx/37577d8ecca35bac1d08f9e1d741e726c63c2da0e65ca4be80aa5ba083cb88ef