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Vitamin B12 injections typically contain synthetic Vitamin B12 a man-made version called cyanocobalamin and can quickly boost the levels of B12 in a persons system as needed

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Czechia Greater than 99.8 % purity confirmed by COA Assay content verified at 55.1 mg Endotoxin level below 0.001 EU/mg No detectable heavy metals or microbial contamination NNMT-related research compound for controlled laboratory studies For research use only not for human or veterinary use For laboratory research only

Cholecalciferol is metabolized to its active form, calcitriol, which increases the body's absorption of calcium and phosphorus

Li, Y., et al