can b12 sublingual be injected Compounded Vitamin B-Complex Injection Amazon.com: Essential Source 2,000 mcg
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But since they can inhabit the guts of animals, us humans can get our B12 intake from meat

Each bottle contains 10mg of 5-Amino-1MQ (RUO) in a lyphillozed format, providing a standardized presentation suitable for controlled investigational and analytical research environments.This product is supplied strictly as a research compound and is not intended for human or veterinary use

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