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Injections bypass digestion and deliver B12 directly into the body, which can be helpful for clients with absorption issues or low B12 levels.
5-Amino-1MQ capsules are less expensive per dose, with 100mg capsules costing $2$5 each in bulk orders
doi:10.1097/qai.0000000000000784 Zhang X, Tong Y, Wang J, Lyu X, Yang R
And so FDA is going to need to use a different lens. Unlike FDA approval of a new drug, which requires years of clinical trials demonstrating safety and effectiveness, placement on the 503A Bulks List answers a different regulatory question