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Unlike taking vitamins orally, they are delivered by injecting directly into the muscle
Researchers have proposed several non-exclusive frameworks, including blood-brain-barrier transport of an endogenous peptide, interaction with the stress axis, circadian and pineal signalling via the alpha-1-adrenergic receptor (PMID 3029331), and neuroprotective activity
But those with diets low in animal protein, like vegetarians or vegans, are at high risk for deficiencies
Starting at the lower end and staying consistent is generally the most sensible approach
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