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It ramps up synthesis of collagen types I and III, along with elastin, fortifying the dermal sheath around each follicle

The answer dictates your math

If your levels are already solid, more B12 won't replace better sleep, smarter training, or dialing in the other variables

Research that combines or compares them is essentially studying two independent compounds that both happen to be of interest in tissue-repair research contexts

These compounds are often explored for different reasons

A precursor to S-adenosylmethionine (SAMe) and the antioxidant glutathione, which protects liver cells from oxidative damage during accelerated fat metabolism