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I had to overcame the initial squick of giving myself a shot first

Low B12 levels can lead to megaloblastic anemia, a condition where red blood cells are abnormally large and unable to transport oxygen efficiently, causing symptoms like fatigue, weakness, and breathlessness

After 1 month of treatment in pernicious anemia patients, the once weekly dosing of 500 mcg B12 intranasal gel resulted in a statistically significant increase in B12 levels when compared to a once monthly 100 mcg IM dose

You can find more about preventing these issues in peptide-storage-stability-guidelines-2

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