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Baseline blood work before starting Before your first dose of any GLP-1 medication, get baseline blood work that includes a complete blood count, comprehensive metabolic panel, ferritin, serum iron, total iron binding capacity, zinc, vitamin D (25-OH), B12, folate, TSH, free T3, free T4, and hemoglobin A1c
Some clinics advertise relatively low rates, while others list much higher prices for what sounds like the same treatment
Deficiency rates in GLP-1 users, per Butsch et al., 2025: vitamin D 7.5% at 6 months rising to 13.6% at 12 months
Check all values against the product label, certificate of analysis, and any applicable professional guidance before relying on the result
doi:10.14309/ajg.0000000000001874
Wei et al., 2025)
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