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Certain populations face higher deficiency risk: vegetarians and vegans (B12 is primarily found in animal products), adults over 50 (decreased stomach acid reduces B12 absorption), individuals with digestive disorders like Crohn's disease or celiac disease, and those taking medications like metformin or proton pump inhibitors
Aronne L, Fujioka K, Aroda V, Chen K, Halseth A, Kesty NC, Burns C, Lush CW, Weyer C
Journal of Strength and Conditioning Research (2015) : This research found that taking 1,000 mg of L-Carnitine daily helped active individuals reduce body fat while preserving lean muscle mass
The reverse is true with glutathione injections as it goes straight into a persons bloodstream leading to increased absorption rate as well as efficacy rate