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Annals of dermatology , 28 (4), 438.

Pernicious anemia, a condition where the body cant absorb enough B12 due to a lack of intrinsic factor, is one such example

they're unregulated, potentially impure, and lack dosage precision, posing health risks like bacterial contamination or heavy metals.[44][45][46] Unregulated online sources amplify dangers with potential counterfeits, unknown additives, or legal violations, as they're not FDA-approved and may lead to adverse effects or inefficacy.[47][48][49] Prioritize compounding pharmacies for reliable, compliant options

The difference between the two is that intramuscular injections are inserted into the muscle, and subcutaneous injections are inserted just below the skin