About the Product

Life Pro Nutrition's NAC 599 mg is a dietary supplement in VCAPS vegetable capsules containing 599 mg of N-Acetyl L-Cysteine (NAC) per capsule, combined with 29 mg of BioPerine® (a patented extract of Piper nigrum with 95% piperine) for optimized absorption. N-Acetyl L-Cysteine is an acetylated derivative of L-cysteine, with greater chemical stability and superior oral bioavailability than free L-cysteine, and is the most clinically used herbal supplement as a precursor to glutathione (the body's primary intracellular antioxidant), with decades of use in medical contexts (as an antidote for paracetamol poisoning and as a mucolytic for respiratory conditions) and a growing number of applications in sports supplementation and general health. The combination with BioPerine® enhances the intestinal absorption of NAC. 1 capsule/day with a meal. 90 capsules (90 days). Vegan. Gluten-free.

Benefits

NAC as a glutathione precursor: the most effective way to supplement the main intracellular antioxidant:

Glutathione (γ-L-glutamyl-L-cysteinyl-glycine tripeptide, GSH) is the most abundant and important low-molecular-weight antioxidant in human cells, with intracellular concentrations of 1 to 10 mM, much higher than any other endogenous antioxidant. Glutathione has multiple functions: direct neutralization of free radicals and reactive oxygen species (ROS) via oxidation of the cysteine thiol group (GSH → GSSG), regeneration of other oxidized antioxidants (Vitamin C, Vitamin E, coenzyme Q10), participation in phase II hepatic detoxification (conjugation of glutathione with xenobiotics and toxic metabolites via glutathione-S-transferases, GST), maintenance of intracellular redox status and protection of proteins against oxidation of cysteine at their active sites, and support for immune function (T lymphocytes require adequate GSH levels for proliferation and effector function). The limitation of direct oral glutathione supplementation is its low bioavailability: glutathione is degraded in the intestinal lumen by gastrointestinal peptidases into glutamate, cysteine, and glycine before being absorbed, which limits the increase in intracellular GSH levels via oral reduced glutathione supplementation (the Life Pro Glutathione product, also in the catalog, partially resolves this limitation via VCAPS and preserved reduced form). NAC solves the problem differently: by providing cysteine (in the stabilized and more bioavailable N-acetyl cysteine form), it makes available the limiting amino acid for de novo glutathione synthesis (cysteine is the amino acid whose intracellular availability is the limiting factor for the activity of γ-glutamylcysteine synthetase, the rate-limiting enzyme in GSH biosynthesis), increasing endogenous glutathione synthesis in cells. This "biosynthesis feeding" pathway is proven to be more effective than direct oral GSH supplementation for increasing intracellular glutathione levels.

Hepatic detoxification: NAC's central role in liver support:

The liver is the organ with the highest concentration of glutathione in the body (up to 10 mM in hepatocytes) as it is the primary detoxification organ and processes a huge load of xenobiotics, metabolites, and toxins that generate reactive species and consume GSH via conjugation (phase II). NAC's role in liver support was initially documented in a medical context: intravenous N-Acetyl Cysteine is the standard antidote for acute paracetamol (acetaminophen) poisoning, where the toxic metabolite NAPQI (N-acetyl-p-benzoquinone imine) depletes hepatic GSH and causes hepatocellular necrosis, and NAC replenishes hepatic GSH, preventing damage. This documented medical mechanism has implications for preventive use in supplementation: in high-intensity athletes, in people with high exposure to xenobiotics (environmental pollution, food additives, moderate alcohol, chronic medication use) or in people with low-protein diets where cysteine intake is limited, NAC can support the maintenance of hepatic GSH levels and phase II detoxification capacity.

Respiratory health: the mucolytic and anti-inflammatory effect on the airways:

NAC has approved medical use as a mucolytic (an agent that reduces mucus viscosity) in respiratory conditions such as chronic bronchitis, COPD (chronic obstructive pulmonary disease), cystic fibrosis, and bronchiectasis. The mechanism involves the breakdown of disulfide bonds between mucus glycoproteins (mucins), reducing viscosity and facilitating expectoration. In addition to the direct mucolytic effect, NAC has an anti-inflammatory effect on the airways via inhibition of NF-κB and reduction of pro-inflammatory cytokines (IL-1β, IL-6, TNF-α) that promote bronchial inflammation. The BioPerine® included in the formula also has an effect claimed by Life Pro of "maintaining open airways" (via the anti-inflammatory action of piperine at the level of the respiratory mucous membranes). For endurance athletes (cycling, running, swimming) with exposure to environmental pollution during training, or for people prone to recurrent respiratory infections, NAC's support for respiratory health can be particularly relevant.

Reduction of oxidative stress induced by intense exercise:

High-intensity training dramatically increases the production of reactive oxygen species (ROS) in muscle mitochondria and activated immune cells, a phenomenon known as "exercise-induced oxidative stress". Mitochondrial ROS production increases proportionally to the rate of oxygen consumption, and during high-intensity efforts (where muscle oxygen consumption can be 100 to 200 times resting levels) ROS production is substantial. This oxidative stress is dual: in moderate doses, ROS are signals of training adaptation (they activate exercise adaptation pathways such as mitochondrial biogenesis via PGC-1α, endogenous antioxidant expression via Nrf2, and muscle hypertrophy); but in excessive doses (overtraining, training without adequate recovery, high environmental exposure) ROS damage muscle proteins, membrane lipids, and DNA, contributing to muscle damage, fatigue, and overtraining immunosuppression. NAC, by increasing GSH synthesis which is consumed in neutralizing muscle ROS, supports the maintenance of antioxidant capacity during and after training.

BioPerine® 29 mg (19 mg piperine at 95%): maximized NAC bioavailability:

BioPerine® (Sabinsa Corporation) inhibits intestinal phase II metabolism enzymes (glucuronyltransferases, sulfotransferases) and P-glycoprotein (an efflux pump that expels compounds from the enterocyte back into the intestinal lumen), increasing the oral bioavailability of multiple nutrients and bioactive compounds. NAC has intestinal and hepatic presystemic metabolism that limits its oral bioavailability: it is repeatedly acetylated and deacetylated throughout absorption and distribution, and part of the oral dose is metabolized before reaching systemic circulation. BioPerine®, by inhibiting these bioavailability-limiting mechanisms, can increase the amount of NAC that reaches systemic circulation and, consequently, the target cells where it is needed for GSH synthesis.

Immune system support:

T lymphocytes require adequate intracellular GSH levels for clonal proliferation in response to antigens, synthesis of effector cytokines (interferon-γ, IL-2), and cytotoxic activity (CD8+ T lymphocytes). GSH depletion in lymphocytes significantly reduces their immune response capacity, and NAC, by increasing intracellular GSH in lymphocytes, can improve immune function, especially in situations of chronic stress (physical or psychological) that are known to deplete GSH and compromise immunity.

Uses

Recommended dose: Take 1 capsule/day with a meal (preferably in the morning or at lunch) to maximize absorption and benefits. Taking with food reduces the risk of gastrointestinal discomfort and improves co-absorption with BioPerine®. Continuous daily use; no cycles or breaks are necessary.