L-Cysteine Powder

L-Cysteine Powder

Source Naturals4.3 (355 ratings)
Format:Powder Quantity: 3 Ounce(s) · 83 servings
Goals
$12.92 $0.15 per serving
VitacostLowest$12.92Amazon$15.02iHerb$18.77iHerb$18.77Pure Formulas$19.59

Product analysis

83 out of 100

L-Cysteine Powder offers an inexpensive, clearly identified source of cysteine that is straightforward to compare with other cysteine supplements.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality85

L-cysteine hydrochloride monohydrate provides a favorable, clearly identified preparation. The specific name gives more clarity about the ingredient than a generic cysteine declaration.

Ingredient Transparency100

Both the cysteine amount and its form are clearly stated. The simple declaration makes comparison with other cysteine products straightforward.

Value For Money100

The cost compares favorably for the cysteine supplied. A single active ingredient keeps the ingredient-cost comparison clear.

Customer Satisfaction67

Customer ratings are generally positive but less enthusiastic than for very highly rated supplements. Several hundred reviews provide a useful view, without identifying specific reasons for differing experiences.

Product Focus47

The single ingredient gives the supplement a narrow cysteine focus. The available information does not establish a clear practical benefit for a particular health goal.

Format
Powder
Container
3 Ounce(s)
Per serving
$0.15
Customer rating
4.3 · 355 ratings
Report analysis

Goals

Longevity
Longevity
Impact
Lower effect
A Ingredient FitF PathwaysF EvidenceA+ Formulation Logic
Study evidence
Cysteine Mixed 2 studies

Ingredients

IngredientAmount per servingScore
L-Cysteine (L-Cysteine Hydrochloride Monohydrate)
 900 mg 94
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
Cysteine (L-Cysteine Hydrochloride Monohydrate) · 900 mg OverallScore94
A- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value
Each serving provides 900 mg of L-Cysteine Hydrochloride Monohydrate, and the estimated cost for its cysteine amount is low. The amount is stated separately.
How this ingredient is rated

Active Ingredient Quality & Bioavailability85

The cysteine is supplied as L-Cysteine Hydrochloride Monohydrate.
Cysteine Form Quality & Stability
The cysteine is supplied as L-Cysteine Hydrochloride Monohydrate.

Dose, Safety & Label Transparency100

Each serving provides 900 mg of cysteine. The cysteine amount is stated separately.
Cysteine Dosage Potency
Each serving provides 900 mg of cysteine.
Ingredient Transparency & Blend Disclosure
The cysteine amount is stated separately.

Value100

The estimated cost for the amount of cysteine is low.
Price per 500mg of Cysteine
The estimated cost for the amount of cysteine is low.
View ingredientView products
86 Performance

L-Cysteine 500 mg

California Gold Nutrition
Base L-cysteine is usable but less stable than a hydrochloride salt; its cysteine quality and focus provide a clearer option when the original already provides a substantial focused cysteine serving. The cysteine amount is substantial for targeted supplementation.
79 Performance

Vegan Hair Skin & Nails

NOW Solutions
Chelated minerals, structural amino acids, hyaluronic acid, and antioxidant vitamins form a coherent hair, skin, and nail formula with good serving value; it offers broader hair or nutrient support rather than a focused cysteine upgrade. High-dose biotin and horsetail without silica standardization are the main limitations; Biotin can distort thyroid, hormone, and cardiac blood tests, so use should be disclosed before laboratory work.
74 Performance

Hair Skin & Nails

Swanson
MSM, well-identified horsetail, cysteine, choline, and PABA form a coherent beauty-focused blend at a low serving cost; it offers broader hair or nutrient support rather than a focused cysteine upgrade. Modest cysteine, choline, and PABA amounts limit depth, while excellent review volume supports confidence in general satisfaction.
89 Budget

L-Cysteine 500 mg

NOW
The hydrochloride form provides a stable cysteine source; the lower serving cost improves economy when the original already provides a substantial focused cysteine serving. The cysteine amount is substantial for targeted supplementation.
90 Budget

L-Cysteine 500 mg

Solgar
The hydrochloride form provides a stable cysteine source; it is among the lowest-cost eligible options, although it is not cheaper than the original when the original already provides a substantial focused cysteine serving. The cysteine amount is substantial for targeted supplementation.
90 Budget

L-Cysteine 500 mg

Bluebonnet
The hydrochloride form provides a stable cysteine source; it is among the lowest-cost eligible options, although it is not cheaper than the original when the original already provides a substantial focused cysteine serving. The cysteine amount is substantial for targeted supplementation.
64 Value

Hair Volume

New Nordic
Biotin, apple procyanidins, zinc, copper, horsetail, cysteine, and methionine form a broad hair-focused blend; it serves a broader goal but does not clearly improve value over the original. Basic mineral forms and modest amino-acid amounts limit depth, while concentrated biotin can interfere with several laboratory tests.
64 Value

Ultimate Hair & Nail Formula

Bluebonnet
A broad nutrient blend uses several useful forms, but many hair-focused amino acids and botanicals are modest; it serves a broader goal but does not clearly improve value over the original. The combined vitamin A amount and long-term vitamin B6 exposure are concerns for routine daily use; Formula breadth offers some value, though several small additions dilute the focus.
58 Value

Cell Formula

Nature's Way
The broad antioxidant blend uses several good nutrient forms, but cysteine makes only a small contribution and some antioxidant amounts are aggressive; it serves a broader goal but does not clearly improve value over the original. The high beta-carotene amount creates a specific concern for current or former smokers.
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Association of dietary sulfur amino acid intake with mortality from diabetes and other causes.
    Dong Z; Gao X; Chinchilli VM; Sinha R; Muscat J; Winkels R; Richie JP · European journal of nutrition · 2022
    Cohort study15,083 participantsLongevity forCysteine
  2. Supplementing Glycine and N-Acetylcysteine (GlyNAC) in Older Adults Improves Glutathione Deficiency, Oxidative Stress, Mitochondrial Dysfunction, Inflammation, Physical Function, and Aging Hallmarks: A Randomized Clinical Trial
    Premranjan Kumar, Chun Liu, James Suliburk, Jean W Hsu, Raja Muthupillai, Farook Jahoor, Charles G Minard, George E Taffet, Rajagopal V Sekhar · The journals of gerontology. Series A, Biological sciences and medical sciences · 2023
    Randomized trial36 participantsLongevity forCysteine