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PlainVitamins

Amino acid · Supplement ingredient

Cysteine

Cysteine is listed on 630 U.S. supplement product labels in the NIH DSLD, #295 of 4,614 by label frequency.

630
Products
#295 of 4,614
By frequency
Verify with NIH DSLD → · FDA Daily Value reference → · Page 3 of 13

How common is Cysteine?

Number of supplement labels listing Cysteine vs nearby amino acid ingredients

products
Source NIH Dietary Supplement Label Database (DSLD) As of 2026

Products containing Cysteine

Hair, Skin & Nails Multi
Vitamer Laboratories
39 ingredients · Other Combinations
On Market
Hair, Skin, & Nail essentials
Healthy Choice Naturals
23 ingredients · Other Combinations
On Market
Hair, Skin, & Nail Health
Nutrilite
20 ingredients · Botanical with Nutrients
On Market
Hair, Skin, & Nail Health
Nutrilite
20 ingredients · Other Combinations
On Market
Hardcore Amino 3000
MET-Rx
34 ingredients · Amino acid/Protein
On Market
Heart Health Black Cherry
Emergen-C
37 ingredients · Other Combinations
On Market
Hema-Plex Capsules
NaturesPlus
41 ingredients · Other Combinations
On Market
Hema-Plex Liquid Delicious Mixed Berry Flavor
NaturesPlus
29 ingredients · Botanical with Nutrients
On Market
Hema-Plex Softgels
NaturesPlus
40 ingredients · Other Combinations
On Market
Hema-Plex Tablets
NaturesPlus
42 ingredients · Other Combinations
On Market
Hema-Plex Tablets
NaturesPlus
42 ingredients · Other Combinations
On Market
High Potency Liver Support Supplement
Vitals
28 ingredients · Other Combinations
On Market
High Potency One-Per-Day Timed-Release Multi-Vitamins & Minerals
Nature's Harmony
47 ingredients · Other Combinations
On Market
HumaPro Exotic Peach Mango
ALR Industries
31 ingredients · Other Combinations
On Market
Hydroxycut +Women
Hydroxycut
22 ingredients · Other Combinations
On Market
ImmuBlast C Raspberry Burst Flavor
21st Century
35 ingredients · Multi-Vitamin and Mineral (MVM)
On Market
ImmuBlast C Ultimate Orange Flavor
21st Century
34 ingredients · Multi-Vitamin and Mineral (MVM)
On Market
ImmuBlast-C Raspberry Burst Flavor
21st Century
33 ingredients · Multi-Vitamin and Mineral (MVM)
On Market
ImmuBlast-C Ultimate Orange Flavor
21st Century
34 ingredients · Multi-Vitamin and Mineral (MVM)
On Market
Immune Defense Formula Ruby Lemon Honey
Emergen-C
37 ingredients · Other Combinations
On Market
Immune Plus System Support With Vitamin D Blueberry-Acai
Emergen-C
37 ingredients · Other Combinations
On Market
Immune Plus System Support With Vitamin D Citrus
Emergen-C
35 ingredients · Other Combinations
On Market
intraKID All-In-One All Natural Raspberry Flavor
Drucker Labs
304 ingredients · Botanical with Nutrients
On Market
Joint Health Essentials
SeniorLife Health
16 ingredients · Other Combinations
On Market
Joint Health Tangerine
Emergen-C
36 ingredients · Other Combinations
On Market
Jointprin +BioPerine
Approved Science
22 ingredients · Other Combinations
On Market
Kidz Vitamin C 250 mg Fruit Grape
Emergen-C
32 ingredients · Other Combinations
On Market
Kidz Vitamin C 250 mg Fruit Orange
Emergen-C
32 ingredients · Other Combinations
On Market
Kidz Vitamin C 250 mg Fruit Punch
Emergen-C
31 ingredients · Other Combinations
On Market
Kidz Vitamin C 250 mg Fruit Punch
Emergen-C
31 ingredients · Other Combinations
On Market
L-Cysteine 500 mg
Douglas Laboratories
4 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Vitamin World
4 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Bluebonnet
5 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Bluebonnet
5 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Solgar
5 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Solgar
5 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Best Naturals
5 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Puritan's Pride Premium
5 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
California Gold Nutrition
5 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Bluebonnet
6 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Lake Avenue Nutrition
5 ingredients · Amino acid/Protein
On Market
L-Cysteine 500 mg
Solaray
4 ingredients · Amino acid/Protein
On Market
L-Cysteine HCl
BulkSupplements.com
1 ingredient · Amino acid/Protein
On Market
L-Cysteine HCl
BulkSupplements.com
1 ingredient · Amino acid/Protein
On Market
L-Cysteine HCl
BulkSupplements.com
1 ingredient · Amino acid/Protein
On Market
L-Cysteine HCl
BulkSupplements.com
1 ingredient · Amino acid/Protein
On Market
L-Cysteine Powder
Source Naturals
1 ingredient · Amino acid/Protein
On Market
Life Essence Women
Pure Essence
91 ingredients · Other Combinations
On Market
LifeEssence Men
Pure Essence
91 ingredients · Other Combinations
On Market
LifeEssence Powder Lemon-Lime Flavor
Pure Essence
72 ingredients · Other Combinations
On Market

Nearby Ingredients in Amino acid

Other ingredients in the Amino acid category cataloged in the NIH DSLD. Useful for comparing how common different nutrients are across the US supplement market.

Compare Cysteine vs Leucine →

Leucine
4,582 products · Amino acid
Glutamine
2,515 products · Amino acid
Valine
1,971 products · Amino acid
Isoleucine
1,946 products · Amino acid
Tyrosine
1,744 products · Amino acid

Nationwide ingredients with similar DSLD presence

Two peer sets for Cysteine: closest on total DSLD label listings (630 here) and closest on distinct brands that list it (205 here). Peers exclude the same DSLD category, and rows stay link-disjoint so each axis is a distinct neighborhood.

Similar label frequency

Nearest other ingredients by distinct DSLD product labels (floored at ≥50), outside this category.

Similar brand breadth

Nearest other ingredients by distinct brands listing them (floored at ≥100 brands), distinct from the label-frequency row.

Frequently asked about Cysteine

How many supplement products contain Cysteine? ▼
630 supplement product labels in the NIH DSLD currently lists Cysteine as an ingredient. By label frequency it ranks #295 of 4,614 among ingredients PlainVitamins ranks (same sort as /rankings/most-common-ingredients). Browse them below.

Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD). Regulatory reference: Source: Dietary Supplement Health and Education Act (DSHEA), 1994, 21 U.S.C. § 321(ff).

Disclaimer, Not Medical Advice: Information on this page is based on manufacturer-declared label data and is provided for educational and reference purposes only. It does not constitute medical, nutritional, or health advice. Consult a licensed healthcare provider before starting, stopping, or combining any supplement, especially if you are pregnant, nursing, take prescription medication, or have a medical condition.

Read our methodology , how this data is sourced, computed, and verified.

Every figure on PlainVitamins is rendered directly from the NIH Dietary Supplement Label Database (DSLD), no number is typed in by an editor. Ingredient figures are computed directly from the NIH DSLD, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.