How Effective Are 3rd and 4th Generation Retinoids: Tazarotene, Adapalene, Bexarotene, and Trifarotene in Skin Rejuvenation?


Retinoids, as vitamin A derivatives, have been used for many years in skin health and anti-aging treatments. Starting with the first generation of retinoids, each new generation has been developed with the goal of more selective action and fewer side effects. While tretinoin is still considered the gold standard today, 3rd and 4th generation retinoids, such as tazarotene, adapalene, bexarotene, trifarotene, and newly synthesized compounds, are also beginning to find their way into dermatological practice.

In this article, we will examine the effects and potential of these new generation retinoids on skin aging, based on current clinical data.

Tazarotene: Potent Effects, Controlled Side Effects
Tazarotene is a prodrug that selectively binds to the RAR-β and RAR-γ receptors. It is currently regulated as a drug and is used topically, particularly in the treatment of acne and psoriasis.

Approved concentrations: 0.045%, 0.05%, and 0.1%

Anti-aging use: 0.1% tazarotene is approved as an adjunctive treatment for fine facial wrinkles, pigmentation, and benign lentigines.

Clinical evidence:
In a large 24-week study in 568 patients, 0.1% tazarotene significantly improved wrinkles, pigmentation, pore enlargement, and skin texture. Its efficacy was similar compared to tretinoin, although some patients reported a more frequent burning sensation, especially in the first weeks.

In conclusion, tazarotene is an effective, safe, and tolerable option. However, its higher price may be one reason it is not as widely used as tretinoin.

Adapalene: An Alternative for Sensitive Skin
Adapalene is a third-generation retinoid known for its RAR-β and RAR-γ selectivity. Its most common use is in acne treatment at 0.1% and 0.3% concentrations. However, in recent years, it has also been tested for photoaging.

Clinical Studies:

A 9-month study found that adapalene reduces wrinkles and blemishes in photoaged skin.

The effectiveness of 0.3% adapalene gel was found to be similar to 0.05% tretinoin cream.

Because it causes less irritation than tretinoin, it may be preferred for sensitive skin.

Nanoformulation studies are also underway for adapalene, aiming to increase its effectiveness and reduce side effects.

Bexarotene: Used Mainly in Cancer Treatment
Bexarotene is a selective agonist that binds to all RXR subtypes. Currently, its primary use in dermatology is the treatment of cutaneous T-cell lymphoma and is applied in a 1% gel form.

However, there are no published clinical studies on its anti-aging effects. Therefore, its use in cosmetic dermatology is limited.

Trifarotene: 4th Generation Retinoid
Trifarotene is the most notable of the 4th generation retinoids.

Approved form: 0.005% cream

Use: Acne treatment

Mechanism: It is a selective RAR-γ agonist, and this receptor is predominant in the dermis.

Animal studies have demonstrated antipigmentation and collagen-regulating effects. These properties make it an important candidate for the treatment of photoaging in the future. However, there are currently no published clinical studies for its anti-aging use.

Seletinoid G: A New Molecule in Research
Seletinoid G is a synthetic retinoid that exhibits RAR-γ selectivity. Small-scale studies have shown that it:

Increases collagen production,

Repairs connective tissue,

Strengthens the skin barrier.

Most importantly, it is suggested to be as effective as tretinoin while not causing irritation. However, these findings were obtained from a limited number of human trials. More studies are needed to establish strong clinical evidence.

Cosmeceuticals and Clinical Evidence
Retinol, retinaldehyde, and retinyl esters are frequently used in the cosmetics industry today. However, these products do not undergo rigorous clinical testing like medications. Therefore, their effectiveness is generally not as strong as prescription forms.

Tretinoin: The gold standard, with the strongest evidence.

Tazarotene and adapalene: Alternatives to tretinoin, with less irritation.

Retinol and retinaldehyde: The most commonly used cosmeceuticals in cosmetics with the strongest clinical evidence.

Retinyl esters: Popular but weakly effective.

This table explains why dermatologists still prioritize tretinoin in their treatment choices.

Nanotechnology: The Future of Retinoids
The biggest problems with retinoids in the skin are:

Unstable structure (sensitivity to light and oxygen)

Low penetration

Risk of irritation

For this reason, nanoformulations were developed. Thanks to nanotechnologies:

Retinoids become more stable.

Controlled release reduces skin irritation.

Penetrates deeper layers.

While current studies show promise for nanoformulations, large-scale clinical evidence in humans is still lacking.

Conclusion: Next-Generation Retinoids Show Promise in Anti-Aging

and 4th-generation retinoids are strong candidates for combating skin aging.