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Some of Kennedy's friends and associates are among the biggest proponents, including self-described "biohacker" and "longevity expert" Gary Brecka, who sells peptide injectables, patches and nasal sprays through his website for $350 to $600 each

Published experimental doses should not be interpreted as medical dosing recommendations

Pros of B12 Injections: Guaranteed delivery into the body Effective for severe deficiency Long history of medical use Less frequent dosing (weekly or monthly) Cons of B12 Injections: Requires medical appointments or self-injection Can be painful and cause injection site reactions Risk of infection or bruising More expensive over time Inconvenient for travel Anxiety or fear of needles Usually uses cyanocobalamin (less bioavailable form) Understanding B12 Oral Sprays Sublingual B12 sprays deliver the vitamin under your tongue, where it's absorbed directly into your bloodstream through the mucous membrane

Cancer Metastasis Rev 38 , 6577 (2019)