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L-Lysine 500 mg

Source Naturals
4.7
★ ★ ★ ★ ★
(798 ratings)
Lysine 500 mg
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Score86
500 mg of l-lysine anchors a solid 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:200 Capsule(s) • (200 servings)
Goals:
Hair Health

Score 86

500 mg of l-lysine anchors a solid 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
$11.99($0.05 per serving)
Amazon
$ 11.99
iHerb
$ 13.40
Vitacost
$ 13.40
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Analysis

The 500 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 500 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

Pros

  • Clearly stated 500 mg amount
  • Focused l-lysine formula
  • Serving amount is easy to identify
  • Favorable value for the supplied quantity

Cons

  • 500 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

87 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

86 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

98 Highest impact

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

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Goals

Hair Health
Hair Health
Impact
High effect
C Goal FitB Strength of SupportD CoverageA Formula Quality
Lysine · 500 mg

L-lysine provides an amino acid needed for protein and collagen formation and may assist iron use. Its hair benefit is most plausible when lysine intake or iron status is inadequate.

The single-capsule amount is meaningful and the hydrochloride form is clearly disclosed. A lone amino acid cannot cover the broader nutritional and follicle pathways involved in hair health.

Study evidence
Lysine Supportive 1 study

Ingredients

IngredientAmount per serving
L-Lysine (L-Lysine Hydrochloride)
 500 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
Lysine (L-Lysine Hydrochloride) · 500 mg OverallScore89
B- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

L-lysine hydrochloride is a stable, well-absorbed form delivered at the lower edge of the effective target range. One capsule supplies the full serving, and no concerning additives are shown in the supplied details. The large capsule count and low cost per active amount provide excellent value, though no special purity grade is claimed.

View ingredientView products
Loading alternative details
86 Performance

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. 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 Performance

L-Lysine 1000 mg

Solgar
A clearly stated L-lysine hydrochloride dose at 1000 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.
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.
84 Budget

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. Its lower serving cost improves routine value compared with the original, although the small calcium addition makes the formula slightly less minimal.
85 Budget

L-Lysine

NOW
A clearly stated L-lysine hydrochloride dose at 435 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

AN Amazing Nutrition Amazing Formulas
A clearly stated L-lysine hydrochloride dose at 1000 mg provides a focused source of this essential amino acid. No eligible candidate with a lower serving cost was available for this slot, so it is included as the closest practical value option; the provided data do not include independent testing or certification details.
86 Value

L-Lysine 500 mg

Carlson
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.
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