Product Comparison
Compare the three NAC routes head-to-head — the studied-dose capsule, the time-release format, and the liposomal-glutathione alternative. In NAC's comparison, the honest principle is: the dose should match the trial evidence, and the route should match the purpose.
At a glance
NOW N-Acetyl Cysteine 600 mg
Jarrow Formulas NAC Sustain
Liposomal Glutathione (The End Product)
Multi-dimensional comparison
Multi-dimensional Comparison
| Metric | 🏆NOW N-Acetyl Cysteine 600 mg NOW Foods | Jarrow Formulas NAC Sustain Jarrow Formulas | Liposomal Glutathione (The End Product) Various (liposomal) |
|---|---|---|---|
| Delivery Form | Capsule | Capsule | Liquid / Softgel |
| Strength | 600 mg | 600 mg (bilayer release) | 500 mg per serving |
| Servings / Container | 100 | 100 | 30 |
| Retail Price | $14.99 | $16.95 | $39.99 |
| Cost / Serving | $0.15BEST 💰 | $0.17 | $1.33 |
| Overall Score | 83/100 | 80/100 | 67/100 |
| 3rd-Party Testing | None | None | None |
| Vegan Friendly | ✓ Yes | ✓ Yes | — No |
Did you know?
The studied dose
The COPD/bronchitis trials used 600–1,200 mg daily of plain oral NAC — the format the top pick matches, the dose the evidence owns. The gram-dose tablets deliver the top of the studied range.
The interaction line
NAC can potentiate nitroglycerin — the documented hypotension risk that puts the medicated user's conversation in a physician's office. The category's most important safety rule.
The short half-life
NAC's plasma half-life is short — the time-release format smooths the peak, and the split-dose pattern (600 mg twice daily) maintains a steadier supply. The timing is a minor optimization, not a mechanism change.
The smell signature
The molecule's thiol group (the same group that breaks mucus bonds) produces NAC's characteristic sulfur odor and taste — normal chemistry, not a defect. The effervescent format masks it best.
The food partner
The richest dietary source of the same rate-limiting substrate (cysteine) — the whey-protein-and-NAC combination is the food-plus-supplement partnership our protein page teaches.
The rescue boundary
The acetaminophen antidote is grams, weight-dosed, under monitoring — a hospital procedure the shelf capsule cannot replicate and should never be asked to. The IV drug and the oral supplement are different tools with the same chemistry.