PlainVitamins

Dr. Stephen Langer's Glutathione Precursor Complex

by Swanson Ultra · capsule · 60 capsules

  • Off the market since November 2023 (NIH)
  • UPC 0 87614 02542 1
  • DSLD label 177879
  • Serving 1 capsule

Dr. Stephen Langer's Glutathione Precursor Complex by Swanson Ultra lists 8 ingredients, 8 with an amount per serving of 1 capsule, such as 100 mg of vitamin C, 100 mg of BIOSINT acetyl L-carnitine, 100 mg of L-glutamine and 100 mg of N-acetyl-L-cysteine. Its current label entered the NIH Dietary Supplement Label Database on June 25, 2018.

What is in Dr. Stephen Langer's Glutathione Precursor Complex?

Each row as the label prints it, per serving of 1 capsule. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

Dr. Stephen Langer's Glutathione Precursor Complex: Supplement Facts rows against the market (DSLD label 177879, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin CVitamin C (Alt. Name: PureWay-C Ascorbic Acid) Note: USP100 mg111%Vitamin C in Dr. Stephen Langer's Glutathione Precursor Complex against 18,583 products100 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg100 mg

50% of 18,583 products listing vitamin C give more (median 100 mg). Per day at the most servings: 200 mg.

PureWay-Cas Ascorbic Acid, Lipid MetabolitesPureWay-C (Form: proprietary formulation of Ascorbic Acid Note: USP, combined with Lipid Metabolites (Form: from Vegetable Waxes) Note: fatty acids)116 mg
BIOSINT Acetyl L-Carnitineas Acetyl L-Carnitine HClBIOSINT Acetyl L-Carnitine (Form: from Acetyl L-Carnitine HCl)100 mgAcetyl L-Carnitine in Dr. Stephen Langer's Glutathione Precursor Complex against 933 products100 mg per serving; the middle half of products list 200 mg to 525 mg, the median 500 mg.100 mg

80% of 933 products listing acetyl L-carnitine give more (median 500 mg). Per day at the most servings: 200 mg.

L-Glutamine100 mgGlutamine in Dr. Stephen Langer's Glutathione Precursor Complex against 1,850 products0.1 g per serving; the middle half of products list 0.356 g to 3 g, the median 1 g.0.1 g

88% of 1,850 products listing glutamine give more (median 1 g). Per day at the most servings: 0.2 g.

N-Acetyl-L-Cysteine100 mgN-Acetyl Cysteine in Dr. Stephen Langer's Glutathione Precursor Complex against 1,259 products100 mg per serving; the middle half of products list 55 mg to 500 mg, the median 150 mg.100 mg

57% of 1,259 products listing N-acetyl cysteine give more (median 150 mg). Per day at the most servings: 200 mg.

Milk Thistle extractas SilymarinMilk Thistle extract (Form: standardized to 80% Silymarin) PlantPart: seeds Genus: Silybum Species: marianum50 mgMilk Thistle in Dr. Stephen Langer's Glutathione Precursor Complex against 1,277 products50 mg per serving; the middle half of products list 90 mg to 300 mg, the median 175 mg.50 mg

83% of 1,277 products listing milk thistle give more (median 175 mg). Per day at the most servings: 100 mg.

Tmgas BetaPower Natural BetaineTMG (Form: from BetaPower Natural Betaine) (Alt. Name: Trimethylglycine)50 mgBetaine in Dr. Stephen Langer's Glutathione Precursor Complex against 731 products50 mg per serving; the middle half of products list 50 mg to 1,250 mg, the median 250 mg.50 mg

74% of 731 products listing betaine give more (median 250 mg). Per day at the most servings: 100 mg.

R-Fraction Alpha-Lipoic Acidas Bio-Enhanced Na-RALAR-Fraction Alpha-Lipoic Acid (Form: from Bio-Enhanced Na-RALA (Form: Sodium R-lipoic acid))37.5 mgAlpha Lipoic Acid in Dr. Stephen Langer's Glutathione Precursor Complex against 2,407 products37.5 mg per serving; the middle half of products list 25 mg to 150 mg, the median 50 mg.37.5 mg

63% of 2,407 products listing alpha lipoic acid give more (median 50 mg). Per day at the most servings: 75 mg.

Setria L-Glutathione Tripeptideas Cysteine, Glutamic Acid, GlycineSetria L-Glutathione Tripeptide (Form: Glutamic Acid, Cysteine, and Glycine) Note: reduced37.5 mgGlutathione in Dr. Stephen Langer's Glutathione Precursor Complex against 717 products37.5 mg per serving; the middle half of products list 10 mg to 200 mg, the median 50 mg.37.5 mg

53% of 717 products listing glutathione give more (median 50 mg). Per day at the most servings: 75 mg.

Source: NIH ODS Dietary Supplement Label Database, label 177879 (entered June 25, 2018), version 9.4.0. See the label on DSLD. Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • 88% of the 1,850 products that print an amount of glutamine list more than its 0.1 g of L-glutamine (filed by NIH under glutamine) (median 1 g).
  • 83% of the 1,277 products that print an amount of milk thistle list more than its 50 mg of milk thistle (median 175 mg).

The NIH database records 2 servings a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

1 product lists the very same ingredients; the nearest amounts come first.

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Suggested Use: As a dietary supplement, take one capsule two times per day with water.
Warnings
Do not use if seal is broken.
Keep out of reach of children.
Warning: Do not take this product if you are pregnant or nursing. Consult your healthcare provider before use if you are taking any prescription medication or if you have a medical condition.
Discontinue use if you experience gastrointestinal discomfort.
Storage
Store in a cool, dry place.

Source: label statements in DSLD label 177879.

What else is on the label?

Other ingredients: Gelatin Capsule, Rice Flour, Magnesium Stearate.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Guaranteed purity & potency.

How many labels does Dr. Stephen Langer's Glutathione Precursor Complex have?

One label is on file, entered on June 25, 2018.

  1. Label 177879 (current) Entered June 25, 2018 · off the market November 29, 2023 · 60 capsules · UPC 0 87614 02542 1

DSLD also links this label to: Glutathione Precursor Complex (image difference, same product).

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Swanson Health Products (distributor), Fargo, ND. All Swanson Ultra products.

Where next?