This product is designed to support your body's antioxidant defenses, but the doses of the two key ingredients fall well short of clinical ranges. **L-Glutathione** (Setria, reduced form) comes in at just 50mg per capsule — most research on oral glutathione uses 250–500mg daily. **L-Cysteine** HCl provides 200mg, roughly a third of the 600mg minimum studied for glutathione support.

**Vitamin C** is the strongest ingredient here for you at 500mg, comfortably within the 250–2,000mg clinical range. It does play a role in recycling glutathione, so there's a logical synergy — but the glutathione and cysteine themselves are too low to expect meaningful standalone benefit.

If your goal is boosting glutathione levels, the cysteine dose here is unlikely to move the needle on its own. You'd need to rely heavily on the vitamin C component, which is well-dosed but serves a broader purpose than targeted glutathione support.

BioStacks
Life Extension

Life Extension, Glutathione, Cysteine & C, 100 Capsules

1 Capsule · 100 servings · $0.17/serving

iHerbAmazon

Best for

Immune

Ingredients (3)

Vitamin C

100%

Dose

500 mg

Target

100–500 mg

Form

Budget

L-Cysteine Hydrochloride

33%

Dose

200 mg

Target

600–1800 mg

Form

Premium

Setria L-Glutathione

20%

Dose

50 mg

Target

250–1000 mg

Form

Premium

Other Ingredients (5)

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Vegetable StearateLubricant

A plant-derived salt of stearic acid (typically magnesium or calcium) used as a tablet lubricant

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

Stearic AcidLubricant

Saturated fatty acid used as tablet lubricant

Microcrystalline CelluloseBinder

Plant-derived cellulose used as a binder and filler in supplements

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

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