b12 injection 1000 mcg Amazon Pharmacy: Vitamin (Injectable Solution) Cyanocobalamin 1,000 mcg / mL

Oral B12 supplementation: High-dose oral cyanocobalamin (10002000 micrograms daily) represents an alternative for patients with dietary deficiency or those without severe deficiency or neurological symptoms, and for those unable or unwilling to receive injections

You cant overdose

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Casecontrol studies show a higher rate of B12 deficiency in people with chronic telogen effluvium compared with controls, and hair often improves after correcting the deficiency

You may have some soreness in the injection area for a few days