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Don't you need a prescription for those supplements (or at least, metformin)?

You can substitute it with over-the-counter Berberine: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5839379/

Or take both like I do. Berberine is not as effective as metformin, but every bit helps when lowering blood sugar levels go.

Where do you get metformin from?