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Lancet 339:677678 Segura M, Ortuno J, Farre M et al (2001) 3,4-Dihydroxymethamphetamine (HHMA)

The activation of hypothalamic-pituitary-testicular axis in puberty induces expression of androgen receptor (AR) and stimulates secretion of testosterone and DHT 9,43,44 , which finally lead the penile growth spurt 9,43,45

They may be recommended for people with B12 deficiency or those who have trouble absorbing B12 from food or supplements

How Vitamin B12 Shots Work Vitamin B12 supplements are extremely common, but oral supplements must pass through the digestive system in order to be fully absorbed