Glutathione histidine glycine nadh
The wording “Glutathione histidine glycine nadh” does not identify a single universally standardized compound, but rather refers to a combination/stack of molecules involved in energy metabolism and antioxidant defenses: glutathione (GSH), the amino acids histidine and glycine (precursors and metabolic modulators), and NADH (the reduced form of NAD). In the sports context, interest is linked to the management of oxidative stress, recovery, and perceived energy, but the clinical evidence varies considerably among the components and depends on the form and route of administration.
“Energy & Recovery” stack: redox support (glutathione) + amino acid precursors + energy cofactor (NADH)
The term “Glutathione histidine glycine nadh” does not identify a single universally standardized compound, but rather refers to a combination/stack of molecules involved in energy metabolism and antioxidant defenses: glutathione (GSH), the amino acids histidine and glycine (precursors and metabolic modulators), and NADH (the reduced form of NAD). In sports, interest is tied to the management of oxidative stress, recovery, and perceived energy, but the clinical evidence varies greatly among the components and depends on the form and route of administration.
Mechanism of action
Glutathione (GSH): the main intracellular thiol; it reduces peroxides via glutathione peroxidase, regenerates antioxidants (e.g. vitamin C/E indirectly), participates in conjugation/detoxification (GST), and maintains protein redox status. NADH: a reduced coenzyme that donates electrons to the mitochondrial transport chain (complex I), contributing to ATP production; it is also involved in cytosolic redox reactions and in the NAD+/NADH balance that influences metabolism (glycolysis, substrate oxidation) and signaling (indirectly through NAD+ availability for sirtuins/PARP, although NADH is not equivalent to an increase in NAD+). Glycine: a precursor of GSH and a modulator of creatine synthesis (via guanidinoacetate), collagen, and porphyrins; it may influence sleep quality and inflammatory response in some contexts. Histidine: an essential amino acid; a precursor of histamine (neurotransmission, vasodilation, gastric secretion) and a component of muscle carnosine (H+ buffering), although beta-alanine is the most studied strategy for increasing carnosine.
Supported benefits
- Improvement in redox/antioxidant biomarkers (e.g. increased GSH or GSH/GSSG ratio) in some contexts, especially with more bioavailable glutathione formulations or with adequate precursors (moderate)
- Reduction in some markers of exercise-induced oxidative stress in specific protocols and populations, with not always consistent results (limited)
- NADH: possible reduction in perceived fatigue in selected clinical conditions (e.g. fatigue syndromes) and in some studies on performance/energy, with high heterogeneity (limited)
- Glycine: potential improvement in sleep quality and subjective recovery in some studies (not specific to athletes), with possible indirect effects on performance (emerging)
- Histidine: support for amino acid/protein status when dietary intake is insufficient; direct performance effects are not well demonstrated if the diet is adequate (limited)
Safety & side effects
- Gastrointestinal disturbances (nausea, cramps, diarrhea), especially with higher doses of glycine or glutathione
- Headache or restlessness in some individuals with NADH (although uncommon, it depends on individual sensitivity and formulation)
- Drowsiness or sleep changes with glycine in some individuals (more often a desired effect, but it may not be welcome)
- Rare hypersensitivity reactions (possible with any supplement)
FAQ
Is it a single compound or a combination?
The term suggests a combination of molecules (glutathione, histidine, glycine, NADH) rather than a single standard chemical compound. The effect depends on the doses, form, and quality of each component.
Can it directly increase training performance?
Direct effects on performance are generally less solid than those of ergogenic supplements with strong evidence (e.g. creatine, caffeine, beta-alanine). The potential benefit is more often indirect (recovery, oxidative stress, sleep, perceived energy) and variable between individuals.
Does oral glutathione actually work?
Results depend on the formulation and the outcomes measured. Some studies show improvements in redox biomarkers, but the bioavailability of standard oral GSH may be limited; liposomal/sublingual formulations or precursor-based strategies may be more effective in some cases.
Is NADH the same thing as NAD+?
No. NADH is the reduced form, NAD+ is the oxidized form. They are interconvertible and participate in cellular redox balance. Supplementing with NADH does not automatically equate to increasing NAD+ in a predictable way.
Does it make sense to add histidine to increase muscle carnosine?
Carnosine depends primarily on beta-alanine availability; histidine is usually less limiting with an adequate diet. For muscle buffering, beta-alanine has more consistent evidence.
Are there risks for competitive athletes?
The main risk is contamination of the supplement with prohibited substances. In addition, high doses or multiple combinations may cause GI disturbances or sleep alterations. Choosing certified products and being cautious with combinations are key considerations.
The information provided is for informational and educational purposes only. It does not constitute medical advice. Use must be evaluated and authorized by a qualified healthcare professional.
Mechanism of action
Glutathione (GSH): the main intracellular thiol; reduces peroxides via glutathione peroxidase, regenerates antioxidants (e.g. vitamin C/E indirectly), participates in conjugation/detoxification (GST), and maintains protein redox status. NADH: a reduced coenzyme that donates electrons to the mitochondrial transport chain (complex I), contributing to ATP production; it is also involved in cytosolic redox reactions and in the NAD+/NADH balance that influences metabolism (glycolysis, substrate oxidation) and signaling (indirectly through NAD+ availability for sirtuins/PARP, although NADH does not equate to an increase in NAD+). Glycine: a precursor of GSH and a modulator of creatine synthesis (via guanidinoacetate), collagen, and porphyrins; it may influence sleep quality and inflammatory response in some contexts. Histidine: an essential amino acid; a precursor of histamine (neurotransmission, vasodilation, gastric secretion) and a component of muscle carnosine (H+ buffering), although beta-alanine is the most studied strategy for increasing carnosine.
Scientific benefits
Contraindications
- Pregnancy and breastfeeding: insufficient data for combined stacks; avoid unsupervised use
- Significant liver/kidney disorders: caution with multiple supplements and professional evaluation
- Histamine metabolism disorders or conditions in which histamine is problematic (e.g. some forms of histamine intolerance): histidine is a precursor of histamine and could theoretically influence symptoms in sensitive subjects
- Cancer therapies: the use of high-dose antioxidants during chemo/radiotherapy is controversial and should be discussed with the oncologist
Side effects
- Gastrointestinal disturbances (nausea, cramps, diarrhea), especially with higher doses of glycine or glutathione
- Headache or restlessness in some subjects with NADH (although uncommon, it depends on individual sensitivity and formulation)
- Drowsiness or sleep changes with glycine in some subjects (more often a desired effect, but it may not be welcome)
- Rare hypersensitivity reactions (possible with any supplement)
Interactions
- Antioxidants and training adaptations: high chronic doses of antioxidants may, in some contexts, blunt redox signals useful for adaptation (an effect not certain for this stack, but a relevant concept)
- Drugs that affect histamine or the nervous system (e.g. sedatives/antihistamines): glycine may increase drowsiness in combination; histidine may theoretically influence the histamine pool
- Drugs that affect redox/mitochondrial metabolism: potential theoretical interactions with NADH; specific clinical data are limited
- Multiple supplements: combining “energy/antioxidant” products may increase the risk of GI effects or insomnia/agitation
Regulatory status
Ingredients commonly found in the supplement market (GSH, glycine, histidine, NADH), with status depending on the country, form, and claims. In the sports context, they do not typically appear on the WADA list as prohibited substances, but quality control remains essential to avoid contamination. Always check local regulations and the policies of your federation/governing body.