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Lumps or hard spots under the skin Firm lumps, nodules, or hardened areas near injection sites can develop for several reasons
Adequate levels can prevent nerve damage, which helps improve coordination and reduce tingling sensations
[2] For this reason, elevated serum homocysteine over 15 micromol/L and methylmalonic acid (MMA) over 0.271 micromol/L are considered better indicators of B 12 deficiency, rather than relying only on the concentration of B 12 in blood
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