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Risk factors for vitamin B12 deficiency include a decreased ability to absorb this vitamin due to low hydrochloric acid secretion, certain medications, or gastrointestinal disease and surgeries

Some researchers also note the concentration in mcg per unit: at 10mg/mL, each unit on a U-100 syringe contains 100mcg (since 10,000mcg per 100 units = 100mcg per unit)

Compounded retatrutide typically comes as a white powder in a sealed vial that must be reconstituted before use

DOI: 10.1038/s41467-017-01114-1 Formulation strategies for therapeutic peptide stability pH, ionic strength, co-solvency

Then switch to a 10mg vial for weeks 9 through 16, where weekly doses of 1mg and 1.7mg consume the vial much faster

The full effects build as you titrate to your target maintenance dose, with maximum efficacy reached 4 to 8 weeks after achieving your final dose