Short chains of amino acids that the body produces naturally, they act as signalling molecules that regulate a remarkable range of functions: metabolism, tissue repair, hormone release, collagen production and brain chemistry
Drug Information 2017
which is kinda scary (Source) much heavier sleep dreaming and dream recall (unusual for me) melatonin-like effects seconds after administration (less energetic, more relaxed), unlike when using melatonin I was not tired when waking up higher libido upon waking up and later during the day (Source) After over a week of using it, I swear by the stuff

A WHO consultation identified the most vulnerable groups as elderly individuals, infants, preschool-aged children, and pregnant or lactating women, due to either increased nutritional demands or impaired absorption capacity ( Addressing the prevention of B12 deficiency and its public health implications requires a comprehensive, life-course approach based on integrated strategies targeting early detection, dietary optimisation, and effective supplementation, in order to mitigate the long-term consequences of inadequate cobalamin status ( Intramuscular (IM) injection is the most invasive and costly administration method, requiring trained personnel and clinical visits