Why does NAC fail on its own?
Most people take NAC because they believe it increases glutathione levels: the body’s "master antioxidant".
But human studies repeatedly show that this does not happen. NAC enters the body, cysteine increases… but glutathione does not increase.
METABOLIC BOTTLENECK
NAC is not the problem.
The problem is that the rate-limiting factor in production is missing: glycine. 1
Without enough glycine, the body cannot complete the glutathione molecule, even with abundant NAC.
The result? NAC alone fails.
01
It rises in the blood… but does not increase glutathione
In a study of immunocompromised patients, NAC increased cysteine in the blood, but glutathione remained unchanged.
"Despite the increase in cysteine… there was no significant increase in glutathione in plasma or cells."
02
Even after 6 months of continuous use… nothing changes
A 6-month clinical trial of NAC (600 mg, 3×/day) showed exactly the same:
"N-acetylcysteine supplementation… did not increase significantly glutathione concentrations."
03
NAC only prevents glutathione from falling
Under chemical stress, NAC prevents glutathione from falling but does not increase it above normal levels.
"NAC prevented the decline in glutathione but did not increase it…"
04
Even injected NAC does not work
Even with intravenous doses (impossible to achieve orally), the result is the same:
"NAC infusion… did not affect whole-blood glutathione."
Conclusion: increasing glutathione is not just about "taking NAC".
Without enough glycine, synthesis does not start and NAC goes unused.
The Modern and Effective Way to Increase Glutathione
If NAC alone does not increase glutathione, what is the solution?
The science is clear: glutathione only increases when NAC and glycine are supplied together.
This combination, known in the scientific literature as GlyNAC, unlocks the rate-limiting step in synthesis.
CLINICAL SOLUTION
GlyNAC provides exactly what the body needs:
NAC (cysteine) + Glycine in the right ratio, finally allowing the molecule to be completed.
The result is consistent: Glutathione rises, oxidative stress falls.
Studies show real increases
GlyNAC Trials 1 show simultaneous improvements in:
- ✔ Intracellular glutathione
- ✔ Oxidative stress
- ✔ Insulin sensitivity
- ✔ Mitochondrial function
NAC Synergic: Maximize Synthesis
GlyNAC works because it provides the essential building blocks. But INSYGMA went further: we reinforced the pathway with enzymatic cofactors that make production more efficient, stable, and continuous.
NAC
PRECURSOR 1
The most effective source of cysteine. The essential starting building block.
Glycine
CRITICAL
The key that unlocks synthesis. Without it, NAC fails.
Vitamin B6 (P5P)
COFACTOR
Active form. Optimizes sulfur metabolism.
Vitamin B2 (R5P)
RECYCLING
Essential for recycling oxidized glutathione.
Molybdenum
DETOX
Processes NAC by-products without metabolic fatigue.
Selenium
DEFENSE
Fuel for the glutathione peroxidase enzyme.
INSYGMA NUTRITION
Espero sentir melhorias…
I feel like I’m doing better mentally; I’ve always really liked NAC
I’ve been taking it for a month and feel very good