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doi: 10.1038/nature04140

Specifically, for hangovers, vitamin B12 will boost your energy and relieve weakness and fatigue

while it is derived from HGH, its structure itself changes fairly much when one looks at hydrogen, nitrogen and oxygens different molecular behaviors

Elderly people, people with digestive disorders (leaky gut, IBS, Chrons, etc), people with anemia or heavy menstrual cycles, and vegans/vegetarians are most at risk of having a B12 deficiency

These age-related changes impair your body's ability to absorb B12 from dietary sources

Consult with a qualified healthcare professional before beginning any supplementation program