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If your B12 levels are quite low, you might need a course of two to three injections before you feel the full benefit

The brand's published materials reference a clinical study (Sost MM et al., Nutrients, 2021) showing that MicrobiomeX intake was associated with shifts in the microbiome toward butyrate-producing bacterial populations

Low molecular weight thiols, such glutathione, have been shown to upregulate the nitric oxide (NO) pathway

Health researchers acknowledge this problem and are working toward determining more accurate cutoffs for deficient, suboptimal, adequate, and excess micronutrient status

There are also economies of scale so buying a bigger bottle of supplements will usually bring the cost down (though always check)