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The first and rate-limiting step involves generating the dipeptide -glutamylcysteine (-EC) from glutamate and cysteine, catalyzed by glutamate cysteine ligase (GCL)
For the average adult seeking to maintain healthy levels or boost energy, a single injection once a month is often the standard protocol
A 2018 review of 11 clinical trials with 251 well-trained athletes found that regular use of L-Carnitine (14 g per day for up to 6 months) improved energy expenditure and physical performance in some athletes
[9] Visual disturbances have been reported in patients with Leber hereditary optic neuropathy, and rapid B12 administration may precipitate optic nerve atrophy in this genetically predisposed population, mandating extreme caution or alternative therapy
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