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No published trials have specifically enrolled participants with hepatic or renal impairment, so safety in these populations is unknown
Chang and his team rotate between injection sites, such as the outer thigh, upper arm, or lower abdomen, to promote healing and ensure consistent absorption
Patients with a severe needle phobia, tremors, poor eyesight, or cognitive impairment should have a partner, family member, or healthcare provider administer the injection instead
If you have a capable helper, then the upper buttocks or arm is a good choice and makes receiving the healthful benefits of B vitamins easier
+ The product-specific studies cited on this page are biochemical, cell-based, analytical, or animal studies
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