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If you experience a gradual onset of numbness, prickling, tingling, or sharp shooting pains in your feet you may be a candidate for B12 injections
The supply chain is shorter, the cost-of-goods is lower, and the global capacity is essentially uncapped
Oral supplements have to pass through the digestive system and may not be absorbed efficiently, especially in people with gastrointestinal conditions like celiac, Crohns, or gastritis
6:6373 doi: 10.1038/ncomms7373 (2015)
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