can b12 injections affect your kidneys Are Shots Safe? Royal Palm Beach Medical Group Vitamin B12 Supplements and Injections

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Adverse reactions reported following methylcobalamin administration include headache, infection, nausea/vomiting, paresthesias, and rhinitis

Dietary deficiency: Vegans (strict vegetarians who do not eat any meat, fish, egg, or dairy products) can develop vitamin B 12 deficiency because they lack vitamin B 12 in their diets

Earlier results may include reduced shedding or improved scalp feel, with visible density changes taking longer

If you're a vegetarian who eats dairy, you can probably get enough B12 from eggs, milk, and other dairy products

Hours 24-48: 41% report "starting to feel different," described as "less heavy," "clearer thinking," or "easier to get out of bed." Hours 48-72: Peak onset window