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The right choice depends on the patients needs and health situation
The smaller size is a more comfortable quantity of liquid injecting into your muscles, thus providing less soreness, but it also leaves room to add a sterile water solution or other vitamins
Without any barriers or extra steps to deter it, your body is able to absorb between 15-97% of the B12 vitamins from the injection
Expert consensus (2024 PMC review)
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