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L-Lysine 500 mg

Natural Factors
4.8
★ ★ ★ ★ ★
(1855 ratings)
Lysine 1000 mg
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Score86
1000 mg of l-lysine anchors a strong single-ingredient option with strong value. Its main trade-off is the high dose, which may be either convenient or restrictive depending on the intended routine.
How scoring works
Quantity:180 Capsule(s) • (90 servings)
Goals:
Hair Health
Immunity

Score 86

1000 mg of l-lysine anchors a strong single-ingredient option with strong value. Its main trade-off is the high dose, which may be either convenient or restrictive depending on the intended routine.
How scoring works

Also available as

1 option
90 servings Lysine 1000 mg • 90 Capsule(s) • 45 servings $9.07 ($0.20 per serving)
$14.67($0.16 per serving)
Amazon
$ 14.67
iHerb
$ 14.67
Vitacost
$ 14.67
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Analysis

The 1000 mg serving provides l-lysine as the main active in capsule(s). The amount gives the product a high-dose profile without adding unrelated actives.

The amount is stated, but the supplied information leaves some formulation detail unspecified. Value is favorable for the supplied amount and serving count, and the focused formula makes comparison with similar products easier.

The strongest practical fit is hair health, with related assessments also supporting lysine-focused use. The main decision is whether 1000 mg and the capsule(s) format match the user's preferred routine and budget.

Who is it for
  • Adults seeking a high-dose Lysine supplement
  • People who prefer capsule(s) for l-lysine
  • Users focused on hair health
Best for
  • Hair Health support
  • Immunity support

Pros

  • Clearly stated 1000 mg amount
  • Focused l-lysine formula
  • Serving amount is easy to identify
  • Favorable value for the supplied quantity

Cons

  • 1000 mg offers little flexibility for lower-dose use
  • Capsule(s) may not suit every user's format preference
  • Single-active formula provides no complementary nutrients

Nutrient quality

92 Highest impact

Ingredient forms and dosing are well aligned with the intended use. The focused formula avoids obvious excesses and low-value additions.

Ingredient transparency

85 Highest impact

Most active amounts are disclosed and core ingredients are identifiable. Missing serving, blend, or excipient details keep the label from being fully transparent.

Customer satisfaction

73 High impact

The aggregate rating is strong and supported by a useful volume of ratings. Specific feedback was not supplied, so recurring complaints and purpose fit remain uncertain.

Value for money

92 Highest impact

Formula quality and serving efficiency provide excellent practical value. Focused ingredients and strong category competitiveness reinforce that advantage.

Report analysis

Goals

Hair Health
Hair Health
Impact
High effect
C+ Goal FitA Strength of SupportD+ CoverageA- Formula Quality
Lysine · 1000 mg

A meaningful lysine dose may support collagen structure and iron use, especially when low iron contributes to shedding. Evidence is more supportive than definitive for lysine as a standalone hair supplement.

The stable hydrochloride form and amount are clearly disclosed. Two capsules are needed for the full serving, but no important product-specific safety concern is evident from the supplied data.

Study evidence
Lysine Supportive 1 study
Immunity
Immunity
Impact
High effect
C Goal FitA- Strength of SupportD CoverageA Formula Quality

Lysine supports protein synthesis and has a situational role in antiviral nutrition, but it is not a broad immune nutrient. The disclosed amount and hydrochloride form are suitable for targeted use.

Evidence is strongest for specific lysine-related uses rather than everyday immune resilience. The single amino acid does not cover barriers, immune-cell micronutrients, or antioxidant defenses.

Study evidence
Lysine Supportive 2 studies

Ingredients

IngredientAmount per serving
L-Lysine (L-Lysine Hydrochloride)
 1000 mg
Gluten Free Adults 18–50 Vegan Dairy Free Sugar Free Vegetarian
Report overview
Lysine (L-Lysine Hydrochloride) · 1000 mg OverallScore82
B- Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyB+ Value

L-lysine hydrochloride provides a standard, well-absorbed form at a dose that aligns well with the collection goals. Two capsules are needed for the full serving, and the supplied label data does not identify a formal purity grade or sourcing claim. The amount delivered per container supports good cost efficiency.

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86 Performance

L-Lysine 500 mg

Carlson
A clearly stated L-lysine hydrochloride dose at 500 mg provides a focused source of this essential amino acid. The provided quality and goal assessments are stronger than the original, although the provided data do not include independent testing or certification details.
86 Performance

L-Lysine 500 mg

Source Naturals
A clearly stated L-lysine hydrochloride dose at 500 mg provides a focused source of this essential amino acid. The provided quality and goal assessments are stronger than the original, although the provided data do not include independent testing or certification details.
85 Performance

Free-Form Lysine 500 mg

Swanson
A clearly stated L-lysine hydrochloride dose at 500 mg provides a focused source of this essential amino acid. The provided collection and goal assessments are well aligned with immunity and hair-support needs, although the provided data do not include independent testing or certification details.
86 Budget

L-Lysine 1000 mg

AN Amazing Nutrition Amazing Formulas
A clearly stated L-lysine hydrochloride dose at 1000 mg provides a focused source of this essential amino acid. Its lower serving cost improves routine value compared with the original, although the provided data do not include independent testing or certification details.
86 Budget

L-Lysine Powder 960 mg

Carlson
A clearly stated L-lysine hydrochloride dose at 960 mg provides a focused source of this essential amino acid. Its lower serving cost improves routine value compared with the original, although the provided data do not include independent testing or certification details.
86 Budget

L-Lysine 1000 mg

Solgar
A clearly stated L-lysine hydrochloride dose at 1000 mg provides a focused source of this essential amino acid. Its lower serving cost improves routine value compared with the original, although the provided data do not include independent testing or certification details.
84 Value

L-Lysine 600 mg

21st Century
A clearly stated L-lysine hydrochloride dose at 600 mg provides a focused source of this essential amino acid. Strong provided quality and goal assessments combine with favorable serving economics, improving the balance of formulation and value; the small calcium addition makes the formula slightly less minimal.
85 Value

L-Lysine Pharmaceutical Grade

Swanson
A clearly stated L-lysine hydrochloride dose at 500 mg provides a focused source of this essential amino acid. Strong provided quality and goal assessments combine with favorable serving economics, improving the balance of formulation and value; the provided data do not include independent testing or certification details.
86 Value

L-Lysine 500 mg

NOW
A clearly stated L-lysine hydrochloride dose at 500 mg provides a focused source of this essential amino acid. Strong provided quality and goal assessments combine with favorable serving economics, improving the balance of formulation and value; the provided data do not include independent testing or certification details.
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Sources

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

  1. Causes of hair loss and the developments in hair rejuvenation.
    Rushton DH; Norris MJ; Dover R; Busuttil N · International journal of cosmetic science · 2010
    Narrative reviewHair Health forLysine
  2. Lysine-fortified wheat flour improves the nutritional and immunological status of wheat-eating families in northern China.
    Zhao W; Zhai F; Zhang D; An Y; Liu Y; He Y; Ge K; Scrimshaw NS · Food and nutrition bulletin · 2004
    Clinical trial264 participantsImmunity forLysine
  3. Success of L-lysine therapy in frequently recurrent herpes simplex infection. Treatment and prophylaxis
    R S Griffith, D E Walsh, K H Myrmel, R W Thompson, A Behforooz · Dermatologica · 1987
    Non-randomized trial52 participantsImmunity forLysine