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Hydroxocobalamin (B12) Injection, 2mg/mL | Olympia Pharmacy Size:Buy 3, Get 1 Free vitamin B12 for deficiency https://lookaside.fbsbx.com/lookaside/crawler/instagram/DV1RYIWjD_R/0/image.jpg Its concentration decreases significantly with age, from approximately 200 ng/mL at age 20 to 80 ng/mL by age 60
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