which b12 is better to take injection or pills Injections vs. Oral Supplements: Better? 9 Best Vitamin B12 Supplements
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10.1089/met.2014.0134 37 GoldbergR

The needle is very short (think insulin syringes), and doesnt go beyond the fat tissue

The lyophilization process may also require differing amounts of bacteriostatic water to reconstitute the sample correctly

We recommend choosing a volume that makes your subsequent dosing calculations as simple as possible
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