weekly vs monthly b12 injection Why Does My Shot Schedule Change to Monthly? Vitamin B12 Injection - Emerge
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Can I get too much vitamin B12

Theres no need for a GP referral

If a person has a biotin deficiency, correcting that deficiency (whether via injections or oral supplements) can indeed reverse symptoms like hair loss or brittle nails, leading to visibly improved hair and nail quality
This is probably the number one error