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These experimental compounds work through various proposed mechanisms, such as stimulating melanocortin receptors in the brain, but lack robust clinical evidence and carry significant safety concerns

Their effects are thought to involve hormonal regulation through neural pathways and/or modulation of immune responses [80]

Supplementing B-12 through injections provides a rapid, bioavailable dose directly into the bloodstream

1,2 Although not clinically validated or available for widespread use, measurement of holotranscobalamin, the metabolically active form of vitamin B 12 , is an emerging method of detecting deficiency