b12 1000 mcg injection Cyanocobalamin – mcg/mL 12 and also works as an appetite stimulant. Cyanocobalamin (B12) Injection - Wells

For more in depth information on potential side effects, read this article from WebMD

Regular injections can alleviate mood disorders and improve mental health

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Here are some factors that can affect how quickly you notice results: Severity of Deficiency: Individuals with mild deficiencies may experience quick relief, but those with very low B12 levels might require several doses before a noticeable difference occurs

It is dispensed in amber multidose vials containing 1,000 mcg/mL and compounded for use under either section 503A or 503B, allowing clinicians to individualize therapy for deficiency states ranging from pernicious anemia to postsurgical malabsorption