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This length is sufficient to bypass the subcutaneous layer and deliver the B12 directly into the muscle
Patients on thyroid hormone replacement should be aware that increased lipolysis can transiently shift free fatty acid levels, which may alter thyroid hormone binding in vitro, though this is unlikely to be clinically significant [4]
PMC 4508379
For individuals sourcing either compound from unregulated online vendors, additional risks include contamination with unknown substances, incorrect dosing due to inaccurate labelling, and the use of non-sterile injection equipment, which can lead to serious infections including abscess formation or sepsis
For those who consume B12 throughout the day from animal products, this isnt usually a concern
Fatigue may result from reduced caloric intake due to appetite suppression, gastrointestinal side effects affecting nutrient absorption, dehydration, blood glucose fluctuations, and the body's metabolic adjustment period during weight loss
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