How is oxidized keratin different from standard keratin supplements?

Standard hydrolyzed keratin focuses on supplying amino acids as building blocks. Oxidized keratin has partially opened disulfide bonds (sulfur-sulfur linkages within the protein), which allows it to interact with cells more actively. Specifically, it stimulates keratinocyte migration and promotes collagen IV expression, the protein that anchors hair inside the follicle.

How was the 43% hair loss reduction measured?

Using a standardized hair pull test: a fixed pulling force is applied to a group of hairs and the number that detach is counted. After 60 days, the KeraGEN-IV group showed a 43.1% reduction versus placebo (p ≤ 0.01).

Why do hair and skin benefits appear together?

Keratin is a shared structural component of both hair and skin. Collagen IV, which oxidized keratin helps upregulate, supports the basement membrane that runs beneath the entire epidermis, not just around follicles. This is why TEWL reduction and elasticity gains appear alongside reduced hair shedding.

Oxidized Keratin Reduces Hair Loss by 43% in Women 45-60, Skin Benefits Included

Women aged 45 to 60 who took the oxidized keratin ingredient KeraGEN-IV for 60 days shed 43.1% less hair than the placebo group, according to a randomized, double-blind, placebo-controlled trial published in HealthMED 2024 (18:2, 35-45). The same 60-day intervention also produced a 10% increase in skin elasticity and a 12.5% reduction in transepidermal water loss.

Trial Design

65 women aged 45 to 60 with generally healthy skin but damaged or stress-affected hair were enrolled. Participants received either KeraGEN-IV or a placebo daily for 60 days. Four outcomes were measured:

Hair loss: standardized hair pull test. Result: 43.1% reduction vs. placebo (p ≤ 0.01)
Hair cortex birefringence: an optical measure of internal protein alignment in the hair shaft. Result: 17.61% improvement
Gross skin elasticity: Result: 10% increase
TEWL (transepidermal water loss): the amount of water that escapes through the skin per hour, a key marker of barrier function. Result: 12.5% reduction (p ≤ 0.05)

Oxidized vs. Hydrolyzed Keratin

Most keratin supplements on the market are hydrolyzed: the protein is broken into small peptides or amino acids to improve absorption. The aim is to supply raw material for hair and nail synthesis.

Oxidized keratin takes a different route. The disulfide bonds (sulfur-to-sulfur links that give keratin its structural rigidity) are partially opened during processing. This altered form interacts with skin cells more actively. KeraGEN-IV is Keraplast’s oxidized keratin ingredient, sourced from New Zealand wool and developed in collaboration with AIDP.

The Collagen IV Pathway

The researchers describe the mechanism as a cascade. Oxidized keratin accelerates keratinocyte migration, where keratinocytes are the cells that form the skin’s outer layers. When these cells are more mobile and active, they upregulate the production of collagen IV.

Collagen IV is the primary structural protein of the basement membrane, the thin sheet of matrix that separates the epidermis from the dermis below it. Every hair follicle is anchored through this membrane. A denser, more intact basement membrane means follicles hold onto hairs with greater force. That is the physical reason fewer hairs detach.

The same basement membrane runs beneath the full surface of the skin, which explains why skin elasticity and water retention improved alongside hair outcomes.

Why This Age Group

Hair shedding in women between 45 and 60 is rarely a single-cause issue. Estrogen decline during perimenopause shortens the anagen phase, the active growth phase of the hair cycle. Shorter anagen means more hairs enter the resting and shedding phase at any given time.

Simultaneously, collagen synthesis in the skin slows with age. The basement membrane thins. Follicle anchoring weakens. The result is that hair loss and skin laxity tend to accelerate at the same time.

This trial enrolled specifically within this window, reflecting that the underlying structural deficit is shared between these two concerns.

What Hair Cortex Birefringence Measures

Birefringence refers to the ability of a material to split light into two beams traveling at different speeds. In a healthy hair shaft, keratin fibrils are aligned in parallel, producing a measurable double-refraction pattern when polarized light passes through. Damaged hair has disrupted fibril alignment, and birefringence drops.

A 17.61% improvement means the internal architecture of the participants’ hair was measurably more organized after 60 days. Fewer hairs were shedding, and the hairs that remained were structurally sounder.

TEWL: A Structural Improvement, Not a Surface One

Transepidermal water loss is measured by holding a sensor a fixed distance from the skin surface and calculating how quickly water vapor escapes. It is considered one of the most reliable objective markers of skin barrier integrity.

A 12.5% reduction in TEWL is not the kind of change seen from applying a heavier moisturizer. It reflects a change in the barrier’s architecture, consistent with the collagen IV upregulation described in the proposed mechanism.

What to Keep in Mind

KeraGEN-IV is a proprietary ingredient not yet as widely studied as established alternatives like biotin or saw palmetto. This trial was industry-funded, and independent replication would strengthen the evidence base. The ingredient is derived from animal wool, making it unsuitable for those following a vegan or strict vegetarian diet.

If you already take a protein supplement or multivitamin that includes hydrolyzed keratin, check the label before adding an oxidized keratin product. The two forms work through different mechanisms and are not equivalent.

For anyone in perimenopause or on hormone therapy, the interaction between exogenous keratin and the hair follicle environment during hormonal transition has not been studied separately. Consulting a clinician before adding new supplements remains the more grounded approach.

Source: HealthMED / Keraplast