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In addition, in the mitochondria, it is a cofactor of methylmalonyl-CoA mutase, the enzyme that catalyses the reversible isomerization of methylmalonyl-CoA to succinyl-CoA, an essential intermediate in the citric acid cycle (TCA, Krebs cycle)

The JAKSTAT pathway: from structural biology to cytokine engineering

doi: 10.1016/0002-9416(84)90091-5

Life 12 , 606 (2022)

And a vitamin B-12 deficiency in particular can have an impact on testosterone levels

Eating nutrient-dense, high-calorie foods like avocado, nut butters, olive oil, smoothies, and protein shakes can help prevent weight loss
