Its a popular choice because the muscle is substantial, and the area typically has fewer nerve endings, which can mean less discomfort during the injection
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doi: 10.2174/1570159x13666160502153022
According to a 2017 systematic review in the Journal of Clinical Nursing confirming that aspiration before subcutaneous injection does not reduce adverse events, subcutaneous injections carry a distinct pharmacokinetic profile that intramuscular delivery disrupts, which is why correct angle and depth matter for predictable results
These symptoms typically resolve within 24 hours.* Not for Everyone: This therapy is not recommended for individuals allergic to cobalamin (B12), those with liver disease, or those currently taking medications that interact with methyl donors
Research is ongoing, but the dual approach is intriguing