Common examples include fatigue or low energy with normal blood results, brain fog or reduced concentration without confirmed vitamin B12 deficiency, stress-related exhaustion or burnout, increased metabolic demand such as during illness recovery, high workload, or intense training, restrictive or inconsistent dietary intake, or suspected poor oral absorption despite normal serum levels
Dorso de lengua con mancha caf-amarillenta, con zona central engrosada por hiperplasia de papilas filiformes
PMID 26001655
Conclusion Although topical glutathione shows promise for dermatological applications, further larger randomized controlled trials with long-term follow-up are necessary to evaluate its utility more comprehensively in improving hyperpigmentation, erythema, and reducing free-radical damage
Some report a slight 'pulse' sensation or fullness