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Gastrointestinal side effects from B12 supplements are typically mild, transient, and often related to inactive ingredients rather than the vitamin itself
My partner and I are very happy with the results
Subcutaneous injections hurt less than intramuscular
For general hair loss or brittle nails in someone who is otherwise healthy, biotin might not make a significant difference, and other causes or treatments should be explored
For the right patient, that profile matters
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