will b12 injection give me energy Do You Need a Prescription for Injections? doctor won't give me b12

New or unexpected symptoms : Whilst rare, allergic reactions to hydroxocobalamin can occur

43 Serum homocysteine is less specific for B 12 deficiency, and can also be elevated in folate deficiency, vitamin B 6 deficiency, vitamin B 2 deficiency, and impaired renal function, hypothyroidism, and by certain medications

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While there's no official upper limit, doses up to 2,000 mcg can be safely used to treat B12 deficiency under medical supervision