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Potential Drawbacks and Side Effects B12 Shots: Require administration by a healthcare provider or self-injection training Can cause minor discomfort, bruising, or soreness at injection sites More costly and less convenient for ongoing maintenance Oral Supplements: Absorption may be inadequate in some individuals Need consistent daily dosing to maintain levels Risk of gastrointestinal upset with high doses (though generally rare) Monitoring and Dosage Considerations Determining the appropriate form and dosage of B12 supplementation requires medical evaluation

And when theres a sufficient amount of red blood cells in your dogs blood, oxygen and nutrients are distributed throughout their body effectively

doi: 10.1016/s0090-6980(00)00099-x 91 ZhangYZhangCShuJGuoJChangH-MLeungPCKet al

Most available evidence comes from laboratory and animal studies