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If you have a vitamin B12 deficiency, a doctor may prescribe B12 injections every other day for 2 weeks until your symptoms improve

Nasal sprays: Research peptide nasal sprays like intranasal retatrutide should be refrigerated after reconstitution and used within the recommended timeframe

Here's exactly how it works, what the science does and doesn't yet show, and how it's used safely under medical supervision

If your symptoms get worse or there is no improvement, be sure to call a doctor

Potential Side Effects Although Vitamin B12 injections are usually harmless, some patients might experience minor side negative effects