Vitamin B12, also known as cobalamin, is a water-soluble vitamin that plays a crucial role in the proper functioning of the body
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Mental Clarity and Concentration Many practitioners of IF report increased mental clarity and concentration, potentially due to changes in the brain structure and energy metabolism

For instance, a 6-week study in 66 people with type 2 diabetes found that taking 30 grams of glutamine powder daily improved multiple risk factors for heart disease and reduced both belly and body fat ( Similarly, a 2-week study using the same amount of glutamine observed decreased waist circumference, a marker for belly fat, in 39 people with overweight or obesity ( In another small study, 6 women who took glutamine supplements for 4 weeks experienced significant reductions in body weight and belly fat without making other dietary or lifestyle changes ( Yet, a study in 24 adults indicated that taking 6 grams of glutamine led to an increase in meal size, which may hinder weight loss ( Moreover, another study that examined the effects of taking a glutamine supplement in combination with exercise noted no benefits for body composition or muscle performance ( Keep in mind that all of these studies used very small sample sizes and only evaluated the short-term effects of glutamine supplements

Abstract Glutathionylation is an important Phase II biotransformation pathway that utilizes glutathione transferases (GSTs) to conjugate glutathione with reactive electrophiles represented by a great diversity in chemical structures
Clin Exp Hypertens 42(5):428437