NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium, 250 Veg Capsules

This supplement came highly recommended by our healthcare provider, and it’s become a daily must-have for our family. I appreciate the transparency and quality of the NOW brand. Since starting it, I’ve noticed a difference in my overall respiratory health and immune resilience. Capsules are easy to take and gentle on the stomach. Reliable, trustworthy, and effective.

NAC helps create and replenish glutathione, a great antioxidant which is indispensable for better health especially as it's declines with age. I trust the "NOW" brand as a quality supplement for NAC (N-Acetyl Cysteine). Moisture can cause some brown dots or discoloration in the capsules (they're still safe to take though) but keep the NAC capsules frozen for optimal freshness and this won't occur.

There are certain essentials in the realm of well-being—those quiet sentinels that work tirelessly behind the scenes. NOW Supplements’ NAC (N-Acetyl Cysteine) with Selenium is one such guardian, a potent ally in the art of resilience.From the moment it arrived, packaged with care and efficiency, I knew I had chosen wisely. Each capsule holds 600mg of NAC, a revered precursor to glutathione, the body’s master antioxidant. Paired with selenium, a trace element that fortifies cellular defense, this formulation is nothing short of an elixir for protection, detoxification, and balance.The 250-count supply ensures longevity, a comforting presence in my daily regimen. With its vegan-friendly composition, free from unnecessary additives, it upholds the purity that every supplement should embody.If wellness is a tapestry woven from intention, this is a thread worth holding onto—a silent guardian in a world that demands strength, clarity, and unwavering vitality. A staple for those who honor the body as a temple of resilience.

NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium, 250 Veg Capsules seem to develop dark spots on the surface showing a localized yellow-orange crystalline or oily substance, with a central dark brown or black spot. This is not evenly distributed, suggesting a localized reaction or contamination. The rest of the capsule appears intact and dry. This suggests oxidation of NAC or sulfur compound leakage, most likely due to a breach or micro-crack in the capsule shell, internal moisture exposure that initiated oxidation, or decomposition of NAC forming sulfur- or selenium-containing degradation products (brown/black). The color change around the site implies chemical migration — not mold, but chemical breakdown. The 2nd picture definitely shows a crystalline structure: Likely oxidized NAC, which can recrystallize when exposed to humidity or heat. Dark central burn-like core is not fungal (no mycelial structure), but suggests concentrated degradation, possibly from a hotspot of oxidation from a breach in capsule integrity allowing air/moisture to interact with the active ingredient. It's a chemical breakdown, not biological growth. The bottle was kept closed, at room temperature in a kitchen cabinet, due to expire in 5/2028. NOW acknowledges that cosmetic changes like speckling may occur due to air exposure, and they consider this not harmful or quality-compromising, provided it’s minor and not accompanied by other signs of spoilage and the capsule is intact, and no strong odor or softening/leakage is present. My capsules have a distinct localized breakdown (yellow-orange material + blackened core) that goes beyond typical speckling — suggesting leakage, oxidation, or reaction. I think refrigerating the bottle with a desiccant packet would allow for a longer shelf life, and if true, NOW should probably say so on the bottle.

I have been taking this supplement for about two years now and this brand is high-quality and really well priced for what you get. I pretty much only order from them nowadays. The supplements are white capsules, medium sized, no weird taste or smell.