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Fast-Acting Joint Formula

4.2
★ ★ ★ ★ ★
(321 ratings)
Keratin 300 mg
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Score77
Quality solubilized keratin is a useful inclusion, but the joint-focused formula is an inefficient choice for dedicated hair or nail support.
How scoring works
Capsule
Quantity:30 Capsule(s) • (30 servings)
Goals:
Hair Health
Nail Health

Score 77

Quality solubilized keratin is a useful inclusion, but the joint-focused formula is an inefficient choice for dedicated hair or nail support.
How scoring works
$29.25($0.97 per serving)
Pure Formulas
$ 29.25
Amazon
$ 29.25
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Analysis

Cynatine FLX supplies 300 mg of specialized keratin, offering better digestibility confidence than generic untreated keratin. The amount is meaningful but below a fuller keratin serving.

Hyal-Joint Complex and Decursinol-50 Angelica gigas extract make the formula primarily a joint product. They add little established value for hair or nail structure and reduce goal-specific coherence.

One capsule per serving is convenient, and the ingredient names and amounts are clear. It suits someone who wants the joint formula first and considers keratin a secondary beauty benefit.

Who is it for
  • Adults seeking the combined joint formula
  • People interested in a moderate Cynatine FLX amount
  • Users who prefer one capsule daily
Best for
  • Joint support with a keratin addition
  • Convenient multi-purpose supplementation
  • People not seeking a dedicated beauty formula

Pros

  • Uses branded solubilized keratin
  • All active amounts are disclosed
  • One-capsule serving is convenient

Cons

  • Keratin amount is moderate rather than full
  • Most ingredients are unrelated to hair and nails
  • Only fair value for keratin-focused use

Warnings

  • Angelica gigas may add to anticoagulant or antiplatelet effects.
  • Safety of the concentrated Angelica extract is not established during pregnancy or breastfeeding.
  • The keratin source is not stated and may matter for animal-protein allergies or dietary restrictions.

Nutrient quality

85 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

80 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

67 High impact

The aggregate rating is favorable, but the available rating volume limits certainty. Specific feedback was not supplied, so recurring complaints and purpose fit cannot be assessed.

Value for money

71 High impact

The core formula offers acceptable value, but serving efficiency is only moderate. Weak extras or category competition reduce the practical return.

Report analysis

Goals

Hair Health
Impact
High effect
A- Goal FitB Strength of SupportC CoverageD Formula Quality
Keratin · 300 mg

Branded solubilized keratin supplies a direct structural hair protein in a clearly stated amount. The amount is moderate rather than full strength, but the specialized form supports better confidence than generic keratin.

The remaining ingredients are designed mainly for joint support and add little reliable help for hair growth or shedding. The formula therefore has useful structural depth but weak coherence as a dedicated hair supplement.

Study evidence
Keratin Disputed 14 studies
Nail Health
Impact
Moderate effect
C+ Goal FitB+ Strength of SupportD CoverageD- Formula Quality
Keratin · 300 mg

Solubilized keratin provides a direct structural protein source that may support nail strength. The surrounding hyaluronic-acid and angelica ingredients are intended for joints and add little nail-specific evidence.

The keratin amount and branded form are clearly stated, although direct nail research for this dose is limited. Most of the formula is unrelated to the selected goal, which weakens its practical focus.

Study evidence
Keratin Adverse 7 studies

Ingredients

IngredientAmount per serving
Hyal-Joint Complex
40 mg
Decursinol-50 Angelica gigas Nakai extract
200 mg
Cynatine FLX
300 mg
Adults 18–50
Report overview
Keratin · 300 mg OverallScore77
A+ Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyD+ Value

The branded Cynatine FLX form provides stronger confidence in keratin quality and absorption. Its disclosed amount is moderate rather than a full target serving. The cost is near the category norm, producing fair value for a branded but smaller active dose.

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Sources

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

  1. The Effects of an Oral Supplementation of a Natural Keratin Hydrolysate on Skin Aging: A Randomized, Double-Blind, Placebo-Controlled Clinical Study in Healthy Women.
    Tursi F; Nobile V; Cestone E; De Ponti I; Lepoudere A; Sergheraert R; Soulard JP · Journal of cosmetic dermatology · 2025
    Randomized trialHair Health Nail Health forKeratin
  2. Halloysite/Keratin Nanocomposite for Human Hair Photoprotection Coating.
    Cavallaro G; Milioto S; Konnova S; Fakhrullina G; Akhatova F; Lazzara G; Fakhrullin R; Lvov Y · ACS applied materials & interfaces · 2021
    In vitro / ex vivo studyHair Health forKeratin
  3. Annurca Apple Nutraceutical Formulation Enhances Keratin Expression in a Human Model of Skin and Promotes Hair Growth and Tropism in a Randomized Clinical Trial.
    Tenore GC; Caruso D; Buonomo G; D'Avino M; Santamaria R; Irace C; Piccolo M; Maisto M; Novellino E · Journal of medicinal food · 2018
    Randomized trialHair Health forKeratin
  4. Comparative Analysis of Type I Keratin Expression By Nail Consistency: An Immunohistochemistry Study.
    Mingorance Álvarez E; Rodríguez-León J; Pérez Pico AM; Mayordomo R · Applied immunohistochemistry & molecular morphology : AIMM · 2022
    Cross-sectional study32 participantsNail Health forKeratin
  5. Keratin/alginate hybrid hydrogels filled with halloysite clay nanotubes for protective treatment of human hair.
    Cavallaro G; Caruso MR; Milioto S; Fakhrullin R; Lazzara G · International journal of biological macromolecules · 2022
    In vitro / ex vivo studyHair Health forKeratin
  6. Patient Satisfaction and Adverse Effects Following the use of Topical Hair Fiber Fillers.
    Babadjouni A; Juhasz M; Pham C; Csuka E; Hedayati B; Evron E; Mesinkovska NA · International journal of trichology · 2024
    Cross-sectional study40 participantsHair Health forKeratin
  7. Exposure to toxic agents alters organic elemental composition in human fingernails.
    Schumacher E; Dindorf W; Dittmar M · The Science of the total environment · 2009
    Cross-sectional study120 participantsNail Health forKeratin
  8. Human keratin diseases: hereditary fragility of specific epithelial tissues.
    Corden LD; McLean WH · Experimental dermatology · 1997
    Narrative reviewNail Health forKeratin
  9. Phenotype and genotype features of Vietnamese children with pachyonychia congenita.
    Chu HT; Dinh Duong TA; Le DH; Le TV; Nguyen BB; Dang CV; Vu QV · Pediatrics and neonatology · 2023
    Case series7 participantsNail Health forKeratin