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Yes, they do
How long does a B12 shot last in your system
Comparison with Other Vitamin B12 Forms Hydroxocobalamin versus Methylcobalamin Hydroxocobalamin is preferred in clinical practice for injections because it lasts longer and has higher bioavailability
Studies show that NNMT inhibition influences metabolic pathways associated with healthspan and longevity
Aside from that, B12 shots also have higher absorption rates than oral supplements, most of which are lost to urine
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