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PYRROLIDINYL DIAMINOPYRIMIDINE OXIDE.

Valuable CAS 55921-65-8 / HAIR CONDITIONING, HAIR WAVING OR STRAIGHTENING

Pyrrolidinyl Diaminopyrimidine Oxide, also known as Kopyrrol, is a multi-functional ingredient primarily recognized for its significant role in promoting hair growth and density. It operates by enhancing scalp health and extending the active growth phase of hair follicles, while also offering benefits for skin vitality and resilience.

Summary

Hair Growth Hair Density Enhancement Anti-Hair Loss Scalp Conditioning Antioxidant Anti-aging Skin Brightening Moisturizing Anti-inflammatory (scalp) Dandruff Reduction

Science

Mechanism of Action

This ingredient stimulates hair growth by improving local blood microcirculation to the scalp and hair roots, alongside opening potassium ion channels. This action facilitates the transition of hair follicles from the resting (telogen) phase to the active growth (anagen) phase, simultaneously prolonging the anagen duration. It enhances nutrient and oxygen supply by boosting growth factors like VEGF and HGF, strengthening hair roots and increasing hair density. Additionally, it counteracts peripilar fibrosis by inhibiting lysyl hydroxylase, maintaining tissue elasticity around hair follicles. For skin, it improves moisture retention, reduces inflammation, and exhibits antioxidant, anti-aging, and brightening effects, contributing to wrinkle reduction and diminishing dark circles.

Research

Clinical Evidence

High confidence
Effective range 0.001–5%
Optimal

1.5%

Key findings

  1. 01 Clinical trials demonstrate that topical formulations, particularly within the 0.5% to 2% range, significantly improve hair density, thickness, and overall hair shaft quality, by increasing hair follicle activity.
  2. 02 A 1.5% topical solution, applied to the scalp at least three times weekly, has been shown to safely and effectively reduce hair shedding and increase hair mass index.
  3. 03 Effective hair growth activity is observed in finished formulations typically using concentrations between 0.001% and 1.5%, with some formulations suggesting efficacy up to 5%.

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
0.001%
Red flag below
0.001%

To achieve meaningful hair growth and scalp benefits, Pyrrolidinyl Diaminopyrimidine Oxide requires specific effective concentrations. Formulations containing less than 0.001% are unlikely to deliver the documented clinical results.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

This ingredient exhibits high stability across a broad spectrum of pH levels and formulation types. However, concentrations exceeding 20% by weight may compromise overall formulation stability. Optimal product integrity requires protection from prolonged exposure to excessive heat and direct light. Comprehensive compatibility testing with other excipients is advised for robust product development.

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
1.5%
Sensitization risk Low

The SCCNFP concluded in 2000 that Pyrrolidinyl Diaminopyrimidine Oxide (as 2,4-DPO) is safe for cosmetic use at 1.5% in an ethanol/water solution, applied topically (6ml, at least three times weekly), without specific warnings or restrictions, though surveillance for side effects was suggested for this then-new substance. It is not classified as a drug in the US or Europe. The compound carries a GHS Hazard Statement H302 ('Harmful if swallowed').

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Pyrrolidinyl Diaminopyrimidine Oxide is a valuable ingredient, particularly for hair and scalp products, offering robust clinical efficacy in promoting hair growth and density at concentrations typically around 1.5%, with a favorable safety profile and broad skin compatibility.

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