NAD+ + Glutathione

The NAD+ / Glutathione / Vitamin C Blend Spray combines three redox-active molecules in one liquid catalog product. None of them is a peptide in the usual research-market sense. NAD+ is a dinucleotide coenzyme [1]. Glutathione is a gamma-linked tripeptide antioxidant [2]. Vitamin C (ascorbate) is a small-molecule vitamin. Each has a real biochemical and, in places, clinical literature; the combination does not. This monograph covers the composition, what each component's literature shows, and the gap between that and this product.

Composition

The catalog listing is "NAD+ / Glutathione / Vitamin C Blend Spray | 10ml". The product is a pre-mixed liquid in a 10 ml spray container, unlike the lyophilized vials that make up most of this catalog. The label states no per-component amounts, and this monograph does not infer any. The three components are:

• NAD+ (nicotinamide adenine dinucleotide), a redox coenzyme and the consumed substrate of sirtuins, PARPs and CD38 [1].
• Glutathione (GSH), γ-L-glutamyl-L-cysteinyl-glycine, the main intracellular thiol antioxidant. Its oxidised disulfide form is GSSG [2].
• Vitamin C (ascorbic acid). VialTalk has no monograph for it, so the vitamin C statements below are cited to PubMed sources only.

What each component contributes

NAD+. NAD+ shuttles electrons in energy metabolism, and it is consumed by enzymes involved in stress signalling and DNA repair [1]. Most actionable human data come from precursors (nicotinamide riboside, NMN), not from NAD+ itself. Precursors can raise circulating NAD+, but clinical benefit is "variable and context-dependent" [4]. In an 80-person randomized placebo-controlled trial, NMN raised blood NAD in healthy adults [6]. Direct NAD+ (as opposed to precursors) is much less characterised. A 2026 narrative review of NAD+ and NAD+ precursors described the human evidence within its scope as "sparse," consisting mostly of small uncontrolled studies, observational investigations and case reports [5]. The NAD+ studies most relevant to a liquid spray format are preclinical only. NAD promoted olfactory-neuron differentiation in human olfactory stem cells and restored olfactory function in anosmic mice [7], and it reduced hippocampal neuron death after traumatic brain injury in rats [8]. In a mouse intracerebral-hemorrhage model, NAD+ raised brain NAD+ content but failed to reduce brain injury [9].

Glutathione. Glutathione is the substrate for glutathione peroxidase, a conjugation partner in phase II detoxification, and a buffer that keeps protein cysteines reduced [2]. Unusually for this catalog, it has randomized human trials in a neurological population. In a Phase I/IIa trial in 30 people with Parkinson's disease, adverse events did not differ meaningfully from placebo over three months [10]. In a 45-person Phase IIb trial, all arms improved, placebo included, and neither glutathione arm was superior to placebo. One participant in the higher-exposure arm developed cardiomyopathy [11]. Those are the strongest data for any component of this product, and they are neutral on efficacy.

Vitamin C. Ascorbate is a water-soluble antioxidant. Once oxidised to dehydroascorbate, it can be reduced back by sulfur-based systems, glutathione among them, that are linked into wider NAD(P)H-dependent redox networks [13]. An older review describes the same cooperative recycling: GSSG is regenerated by glutathione reductase, enzymatic pathways recycle the ascorbate radical and dehydroascorbate, and the electrons for these reactions ultimately come from NADH and NADPH [14].

Combination evidence — the honest boundary

A PubMed search for "NAD glutathione" returns thousands of records. They are overwhelmingly about the biochemistry linking the two molecules, not about giving them together. A narrower search combining NAD, glutathione, vitamin C and the spray format returned no records (October 2026). No study was found that tests NAD+, glutathione and vitamin C co-formulated, in any form, in humans, animals or cells. The component monographs cover each molecule on its own [1][2].

The closest related work:

• A 2026 methods study measured NAD(P)(H) and glutathione forms together in whole blood. Both stayed stable across ages 18–70, and the NAD+ booster nicotinic acid raised blood NAD+ [3]. This is a measurement method, not a test of this product.
• The biochemical rationale (ascorbate, glutathione and NAD(P)H sharing a recycling chain [13][14]) is mechanistic and textbook-level. It does not show that delivering all three from outside the body adds anything.
• In the glutathione skin-lightening literature, routine combined use of vitamin C has made it harder to tell what glutathione does on its own [12]. That is a caution against assuming combined products are easier to interpret.

The format adds its own unknowns. Nothing establishes how stable NAD+, reduced glutathione and ascorbate are together in one solution, and reduced GSH oxidises readily in solution [2].

Research context

The "redox triad" idea behind this product is biochemically coherent, but that is not evidence of effect. The Phase IIb glutathione Parkinson's trial was neutral against placebo [11], and the NAD+ data closest to this product format are preclinical [7][8][9]. Any research use of this product is testing an uncharacterised mixture.

Storage and handling

This is a liquid product, so lyophilized-vial guidance does not apply. There are no published stability data for this three-component solution. Yellowing is a recognised sign of glutathione oxidation [2].

Quality and COA considerations

A meaningful COA needs per-component identity and assay: NAD+ content, glutathione content with the reduced/oxidised (GSH:GSSG) ratio reported [2], and ascorbate content. Because the components can degrade in solution, the COA should state the test date and confirm the assay was run on the finished liquid, not the raw inputs. Microbial and endotoxin testing should be reported.

Key references

1. [1] VialTalk monograph — NAD+ — https://vialtalk.com/forum/peptide-research-library/nad-plus-research-monograph-coenzyme-precursors-evidence
2. [2] VialTalk monograph — Glutathione — https://vialtalk.com/forum/peptide-research-library/glutathione-research-monograph-tripeptide-antioxidant
3. [3] Dynamics of blood NAD and glutathione in health, disease, aging (2026) — https://pubmed.ncbi.nlm.nih.gov/42628241/
4. [4] NAD+ biology and supplementation (review, 2026) — https://pubmed.ncbi.nlm.nih.gov/42489969/
5. [5] Narrative review of NAD+ and NAD+ precursors (2026) — https://pubmed.ncbi.nlm.nih.gov/42787547/
6. [6] NMN in healthy middle-aged adults, randomized controlled trial — https://pubmed.ncbi.nlm.nih.gov/36482258/
7. [7] Yoo et al. 2026 — NAD and olfactory dysfunction — https://pubmed.ncbi.nlm.nih.gov/42380286/
8. [8] Won et al. 2012 — NAD+ and TBI-induced neuron death in rats — https://pubmed.ncbi.nlm.nih.gov/22352983/
9. [9] Tsuchiyama et al. 2009 — NAD+ after intracerebral hemorrhage in mice (negative) — https://pubmed.ncbi.nlm.nih.gov/19298759/
10. [10] Mischley et al. 2015 — Phase I/IIa glutathione in Parkinson's disease — https://pubmed.ncbi.nlm.nih.gov/26230671/
11. [11] Mischley et al. 2017 — Phase IIb glutathione in Parkinson's disease — https://pubmed.ncbi.nlm.nih.gov/28436395/
12. [12] Glutathione for skin lightening: critical narrative review (2026) — https://pubmed.ncbi.nlm.nih.gov/42751591/
13. [13] Heshiki et al. 2026 — Ascorbate recycling as a molecular redox capacitor — https://pubmed.ncbi.nlm.nih.gov/42587798/
14. [14] Chan, Chow & Chiu 1999 — Interaction of antioxidants (review) — https://pubmed.ncbi.nlm.nih.gov/10601886/

Research-use note: This is an educational summary of the published research on NAD+, glutathione and vitamin C as individual compounds. The three-component spray has not been evaluated in any published study, and none of its components is approved for any indication in this form. Nothing here is medical advice or a usage recommendation.