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L-Cysteine Powder

Source Naturals
4.3
(160 ratings)
Cysteine 900 mg
Product Image
Score 95.0

A highly potent and cost-effective L-Cysteine powder offering 900mg per serving, ideal for maximizing immunity, detoxification, and skin/hair health benefits.

Quantity: 3 Ounce(s)Servings size: 1 Gram(s) (83 servings)
Selected goals:
Other goals:
Immunity
Detoxification
Skin Health
Hair Health

Score 95.0

A highly potent and cost-effective L-Cysteine powder offering 900mg per serving, ideal for maximizing immunity, detoxification, and skin/hair health benefits.

Analysis

Source Naturals L-Cysteine Powder provides a robust 900mg of L-Cysteine Hydrochloride Monohydrate per serving. This high dosage is significantly beneficial for maximizing the body's natural production of glutathione, a master antioxidant crucial for immune system strength, effective detoxification processes, and cellular protection. The powder form offers versatility, allowing users to easily adjust their intake or mix it into beverages, which can be particularly advantageous for those seeking higher therapeutic doses or looking to avoid capsules. While powders may be less convenient for on-the-go use, the cost-per-serving at $0.22 for such a substantial dose makes it an exceptional value. Online reviews and nutritionist recommendations frequently highlight L-Cysteine's efficacy in supporting these core health areas, and this product's purity and potency align well with those expectations.

Pros
  • Highest L-Cysteine dosage per serving (900mg) among the analyzed products.
  • Excellent cost-per-serving value for the high potency.
  • Powder form provides dosing flexibility.
  • Directly supports enhanced glutathione production.
Cons
  • Powder form may be less convenient for some users compared to capsules.
  • Potential for unpalatable taste if not mixed properly or if sensitive to amino acid taste.
Warnings
  • Individuals taking nitrates for heart conditions or certain blood pressure medications should consult a healthcare professional before use, as L-Cysteine can affect nitric oxide pathways.
  • High doses may cause mild gastrointestinal discomfort in sensitive individuals.
$16.89($0.20 per serving)
Vitacost
$ 18.89
Amazon
$ 18.51
iHerb
$ 16.89
Ingredients
IngredientAmount per serving
L-Cysteine (L-Cysteine Hydrochloride Monohydrate) 900 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free
Categories
Cysteine 98.0
As a pure L-Cysteine product with a high, effective dose, it stands out within the Cysteine collection for its targeted and potent delivery of this amino acid, making it ideal for those specifically seeking L-Cysteine benefits.
Goals
Immunity 95.0
The 900mg L-Cysteine dosage provides ample precursor material for glutathione synthesis, significantly enhancing the body's antioxidant defenses and supporting robust immune cell function.
Detoxification 95.0
This high concentration of L-Cysteine directly supports the liver's primary detoxification pathways by boosting glutathione levels, which are essential for neutralizing and eliminating various toxins from the body.
Skin Health 90.0
L-Cysteine is a crucial building block for keratin, a primary protein in skin, and its role in glutathione production helps protect skin cells from oxidative damage, contributing to improved skin integrity and appearance.
95 Value

L-Cysteine 500 mg

NOW
4.4
(18851 ratings)
Delivers an optimal L-Cysteine dose with added Vitamin C and B6 at a fraction of the cost per serving, making it an undeniable leader in value compared to the extremely expensive powder.
75 Value

L-Cysteine 500 mg

Solgar
4.5
(1545 ratings)
Although not the absolute cheapest, Solgar offers a reliable 500mg L-Cysteine supplement from a trusted brand at a significantly better price per serving than Source Naturals powder, ensuring solid value.
80 Value

Hair Skin & Nails

Swanson
4.7
(3284 ratings)
An excellent value option that combines a beneficial amount of L-Cysteine with other important beauty ingredients like MSM and Horsetail, providing multiple benefits at a very low price.
98 Performance

Hair Force

KAL
4.5
(257 ratings)
Contains 500mg L-Cysteine and a comprehensive blend of hair-supporting nutrients, offering a more complete and potent solution for hair health than a pure L-Cysteine product.
92 Performance

Vegan Hair Skin & Nails

NOW Solutions
4.7
(3911 ratings)
Combines L-Cysteine (250mg) with MSM, Hyaluronic Acid, and Biotin, providing a superior synergistic effect for skin and hair compared to a standalone L-Cysteine product.
95 Performance

L-Cysteine 500 mg

NOW
4.4
(18851 ratings)
Includes synergistic Vitamin C and B6, which enhance L-Cysteine's effectiveness for collagen synthesis and metabolism, making it functionally superior for the stated goals.
95 Budget

L-Cysteine 500 mg

NOW
4.4
(18851 ratings)
Offers a standard 500mg L-Cysteine dose plus Vitamin C and B6 at an exceptionally low price per serving (11 cents), making it vastly more affordable and effective than the Source Naturals powder.
75 Budget

L-Cysteine 500 mg

Solgar
4.5
(1545 ratings)
Provides a pure 500mg L-Cysteine from a reputable brand at 21 cents per serving, offering a significantly lower cost for a quality L-Cysteine supplement compared to the Source Naturals powder.
80 Budget

Hair Skin & Nails

Swanson
4.7
(3284 ratings)
A highly economical choice at 11 cents per serving, it includes L-Cysteine (100mg) along with MSM and Horsetail, providing a broader range of beauty benefits for significantly less cost.
95 Value

L-Cysteine 500 mg

NOW
4.4
(18851 ratings)
Delivers an optimal L-Cysteine dose with added Vitamin C and B6 at a fraction of the cost per serving, making it an undeniable leader in value compared to the extremely expensive powder.
75 Value

L-Cysteine 500 mg

Solgar
4.5
(1545 ratings)
Although not the absolute cheapest, Solgar offers a reliable 500mg L-Cysteine supplement from a trusted brand at a significantly better price per serving than Source Naturals powder, ensuring solid value.
80 Value

Hair Skin & Nails

Swanson
4.7
(3284 ratings)
An excellent value option that combines a beneficial amount of L-Cysteine with other important beauty ingredients like MSM and Horsetail, providing multiple benefits at a very low price.
98 Performance

Hair Force

KAL
4.5
(257 ratings)
Contains 500mg L-Cysteine and a comprehensive blend of hair-supporting nutrients, offering a more complete and potent solution for hair health than a pure L-Cysteine product.
92 Performance

Vegan Hair Skin & Nails

NOW Solutions
4.7
(3911 ratings)
Combines L-Cysteine (250mg) with MSM, Hyaluronic Acid, and Biotin, providing a superior synergistic effect for skin and hair compared to a standalone L-Cysteine product.
95 Performance

L-Cysteine 500 mg

NOW
4.4
(18851 ratings)
Includes synergistic Vitamin C and B6, which enhance L-Cysteine's effectiveness for collagen synthesis and metabolism, making it functionally superior for the stated goals.