9glycine propionyl-l-carnitine pycnogenol (chloride) (CAR 3:0, C3:0 Carnitine, L-Carnitine propionyl ester, Levocarnitine propionate, L-Propionylcarnitine, ST 261, CAS Number: 119793-66-7) C3) Propionyl-L-carnitine-(N-methyl-d3) | CAS#:1334532-19-2
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[DOI] [PMC free article] [PubMed] [Google Scholar] 100.Liu Z, Yokoyama NN, Blair CA, Li X, Avizonis D, Wu XR, Uchio E, Youssef R, McClelland M, Pollak M, Zi X

They are intended for non medical practice or cosmetic use only

The idea with methylcobalamin is that, in some cases, its better absorbed and retained in the body, Cording says

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The 80% bioavailability, the extensive clinical trial data, the standardized dosing protocols, and the predictable outcomes make it the gold standard against which all alternatives are measured
