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https://i.ebayimg.com/images/g/~cQAAeSwNw1p6tAm/s-l1200.jpg While all four types of vitamin B12 ultimately serve to prevent deficiency, their bioavailability and absorption rates vary significantly: • Synthetic vs Size:1000 mcg/ml - 30 ml x 2 B Injection Rx B12 - Oral Cyanocobalamin Liquid, Alternative to Monthly B12 Injections | Rx Vitamins – RX Vitamins
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