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L-Cysteine 500 mg

California Gold Nutrition
4.6
★ ★ ★ ★ ★
(2022 ratings)
Cysteine 500 mg
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Score81
A clearly disclosed 500 mg cysteine serving with good value, focused on one antioxidant pathway.
How scoring works
Quantity:60 Capsule(s) • (60 servings)
Goals:

Score 81

A clearly disclosed 500 mg cysteine serving with good value, focused on one antioxidant pathway.
How scoring works
$14.40($0.24 per serving)
iHerb
$ 14.40
Amazon
$ 18.22
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Analysis

The 500 mg serving supplies base L-cysteine in a capsule. The base form is direct but less stable than alternative cysteine forms.

L-cysteine can contribute to glutathione production, giving it a clear antioxidant-building-block role. It has less direct healthy-aging evidence than NAC and covers only one pathway.

The single-active design keeps the purpose clear and easy to assess. Good value supports practical routine use.

Who is it for
  • Adults specifically seeking L-cysteine
  • Users wanting a focused antioxidant precursor
Best for
  • Glutathione-building-block support
  • Simple daily cysteine use

Pros

  • Provides 500 mg of base L-cysteine
  • Simple base L-cysteine formula
  • Capsule format
  • Good value

Cons

  • Less stable than hydrochloride or NAC
  • Covers only one antioxidant pathway
  • No broader antioxidant blend

Nutrient quality

91 Highest impact

Base L-cysteine is usable but less stable than a hydrochloride salt. The cysteine amount is substantial for targeted supplementation.

Ingredient transparency

83 Highest impact

Every listed active has an individual amount and no proprietary blend hides key doses. Daily directions and the complete inactive-ingredient list are not supplied.

Customer satisfaction

67 High impact

The supplied average is favorable and the aggregate pool is substantial. No specific feedback is provided to assess recurring complaints or whether experience matches the intended use.

Value for money

77 High impact

Serving cost is moderate for the disclosed active amount. The focused design avoids paying for unnecessary active ingredients.

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Ingredients

IngredientAmount per serving
L-Cysteine
500 mg
Gluten Free Adults 18–50 Dairy Free
Report overview
Cysteine · 500 mg OverallScore86
B- Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyA+ Value

The single-capsule serving provides a clearly disclosed amount close to the commonly used range for antioxidant support. Base L-cysteine is less stable than NAC or a hydrochloride salt, which is the main quality trade-off. The focused formula and low cost for the active amount make it a practical cysteine option.

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91 Performance

L-Cysteine 500 mg

Bluebonnet
The hydrochloride form provides a stable cysteine source; its cysteine quality and focus provide a clearer option when the original uses base cysteine with less stability detail than a hydrochloride salt. 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 uses base cysteine with less stability detail than a hydrochloride salt. The cysteine amount is substantial for targeted supplementation.
90 Budget

L-Cysteine 500 mg

Solgar
The hydrochloride form provides a stable cysteine source; the lower serving cost improves economy when the original uses base cysteine with less stability detail than a hydrochloride salt. The cysteine amount is substantial for targeted supplementation.
93 Budget

L-Cysteine Powder

Source Naturals
The hydrochloride form provides a stable cysteine source; the lower serving cost improves economy when the original uses base cysteine with less stability detail than a hydrochloride salt. 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.
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