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Methylcobalamin is the bioactive form of B12 and does not require conversion
Are B12 injections better than B12 supplements
Topical and Nasal AOD-9604 Topical and nasal forms appear in marketing, but the FDA review found no published human exposure data for transdermal or intranasal AOD-9604
Y., Lin, Y., & Pang, J
A randomized clinical trial
If there is a risk of poor subject compliance with injections and/or a need for convenient administration, then researchers should certainly consider a BPC-157 + TB-500 nasal spray
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