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doi: 10.3390/app112411661

Patients with a personal or family history of medullary thyroid carcinoma represent another critical contraindication for tirzepatide-containing formulations

Better sleep doesnt replace B12, but it can reduce the sense that treatment isnt working

I also note that you have potential thyroid issues - lots of cross-over between thyroid/B12 deficiency symptoms - so might not be easy to sort out which symptoms are due to what

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Many people looking into B12 options also consider injectables as a way to support anti-aging benefits