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https://www.physiciansplan.com/wp-content/uploads/2025/12/download-127.webp Nootropics Vitamin B Complex Vitamin B12 Injection, 500 mcg, 50x3 ml at ₹ 545/box in Bijnor Variant:20mg If subclinical vitamin B12 is suspected, then circulating total vitamin B12 or transcobalamin (TC)-bound B12 (i.e., holo TC) in serum should be measured first, followed by methylmalonic acid (MMA) or homocysteine in serum, both more sensitive functional biomarkers that reflect B12 stores rather than intake
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