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Tesamorelin is an FDA-approved prescription therapeutic (brand name Egrifta) for a specific clinical indication, and its use for general bodybuilding, fat loss, or anti-aging purposes in people without that diagnosis is an off-label application, not an over-the-counter supplement use

I add this meaning since the study below and the following audits, had the very opposite effect on preventing illness in B12 deficient patients.) This report states

For those managing a diagnosed deficiency, ongoing treatments may be recommended on a consistent schedule

Van Dorpe S, Bronselaer A, Nielandt J et al (2012) Brainpeps: the blood-brain barrier peptide database