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Intranasal administration of mouse [D-Leu-4]OB3, a synthetic peptide amide with leptin-like activity, enhances total uptake and bioavailability in Swiss Webster mice when compared to intraperitoneal, subcutaneous, and intramuscular delivery systems

As a whole b12 serves as co-factor for many reactions in the body including proper functioning of the nervous system, metabolism, neurotransmitter production, DNA repair, cell membrane production, and more

This is informed speculation, not proven protocol

When the compounds being compared are structurally related but mechanistically distinct, sourcing quality and consistency become study design variables in themselves