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However, even if you eat enough to get the recommended dose (2.4 micrograms in people 14 and older), older adults and people with gastrointestinal issues may have problems absorbing it properly

Long-Term Protocols: The most clinically relevant studies evaluated subcutaneous doses of 0.25 mg (250 mcg), 0.5 mg (500 mcg), and 1 mg (1,000 mcg) administered daily for 24 weeks

Serious adverse effects are rare but have been reported, particularly with IV administration of thiamine

In mouse models of insulin resistance, it significantly inhibits NNMT activity in liver and muscle, reduces NAM methylation, increases intracellular NAD+, activates the SIRT1 pathway, promotes phosphorylation of insulin receptor substrate 1 (IRS1), enhances insulin signaling, improves insulin sensitivity, and increases glucose uptake and utilization