Determining the correct B12 dosage can be tricky, as the appropriate amount depends on factors such as age, the severity of deficiency, and any coexisting conditions
We feel safe here and we recommend this place to anyone that needs an IV to keep hydrated or anyone that needs extra IV supplements

A number of studies support NAD + regeneration as a therapeutic strategy to benefit patients with obesity.[27] For examples, natural NAD + precursor activators such as nicotinamide riboside (NR) administered via dietary supplements to high-fat fed mice protected against diet-induced obesity, increased energy metabolism, and improved insulin sensitivity;[41] some of these effects were shown to be mediated by NAD + -dependent SIRT1 activation.[42] Similarly, systemic administration of NMN improved glucose tolerance and diet- and age-related insulin resistant conditions.[43, 44] However, dietary supplemental NAD + precursors (e.g., NR, NMN) require chronic administration and/or very high pharmacological doses to achieve physiologically beneficial enhancements in the NAD + levels, which potentially limit use in humans.[27] It could be predicted that combined administration of sub-maximal doses of dietary supplements and NNMT inhibitors that function as activators of NAD + might produce synergistic improvements in diet-induced obesity, and reduce adverse effects associated with chronic high-dose administration of dietary supplemental NAD + precursors

NHS treatment protocols involve intramuscular loading doses followed by maintenance therapy, with frequency determined by underlying cause and severity
There is no quick fix it is going to take time to heal the nerve damage that has occured