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Whilst the intrinsic factor-mediated absorption pathway can only process approximately 1.52 micrograms of B12 at a time, passive diffusion allows absorption of about 1% of higher doses
It depends on the molecule, but different peptides claim to aid recovery, build muscle, enhance cognition, increase longevity, and even promote a deeper tan, among other possible perks
10.1073/pnas.0807500105 161
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