Product

Peter Thomas Roth Retinol Fusion PM

1.5% microencapsulated retinol — one of the highest disclosed doses you can buy without a prescription, and it is exactly as strong as that sounds.
At a Glance
Mixed

A higher percentage can do more, but it also raises the chance of redness, dryness, and peeling. The best strength is the highest one your skin tolerates without staying irritated — not simply the biggest number.

This formula uses microencapsulated retinol. Encapsulation protects retinol from air and light and slows its release, which can soften the irritation peak. It does not make retinol stronger.

Jumping straight to a high dose is the most common reason people decide they "cannot tolerate retinoids." Starting lower and building up usually gives better results over time.

Key facts

Key activeRetinol 1.5%
TextureLightweight silicone serum
Best forExperienced users only
Approximate price$55–$65
FragranceFragrance free

How it works

1.5% is a very high over-the-counter dose, and Peter Thomas Roth discloses it. That combination — high and honest — is rare. Most brands that go this strong hide behind a "complex."

Fragrance-free, in an opaque pump bottle rather than a jar. The packaging is right.

The ingredient list is short — twelve items — which means little to react to beyond the retinol itself.

Encapsulation is a real technology, and it does two things: it protects the retinol from air and light, and it slows the release, which flattens the irritation peak. It does not make retinol stronger.

Irritation is expected, not a sign it is "working." Redness, flaking and stinging in the first weeks are common with any real retinoid. Start twice a week and build up. If it is still angry after a few weeks, the dose is too high for you.

Everyday habits

How to use it
  • When: Start 2 to 3 nights a week, always at night.How much: Use a pea-sized amount for the whole face. Steps: Apply to clean, dry skin. To reduce irritation, you can buffer by applying moisturizer first, then the product, then more moisturizer. Sunscreen: Wear sunscreen every morning. Retinoids make skin more sensitive to the sun. What to expect: Some dryness or peeling is common early on, and more likely at this strength. Build up the number of nights slowly. Careful: Avoid the immediate eye area. Do not layer it with other strong actives at first.
Who should be careful+

1.5% will irritate you. "Time-released" softens the peak; it does not make a high dose gentle. Reviewers report real peeling, and that is the expected outcome of the dose, not a defect.

This is not a beginner product. If you have never used a retinoid, start at 0.2–0.3% and work up. Starting here is the classic way to quit retinoids forever.

The "time-release" claim is not independently verifiable. Encapsulation is real; this brand's specific system, and any claim about how long it releases for, is proprietary and untested against alternatives.

It contains alcohol, and the short ingredient list means there is very little barrier support to offset the dose.

$65 an ounce, and the price barely improves at larger sizes.

Questions people ask+
Is 1.5% too strong for beginners?For most people, yes. Start with a lower dose and work up.
Does encapsulation make it gentler?It can flatten the irritation peak, but a high dose is still a high dose.
Is it fragrance-free?Yes.
Why is there alcohol in it?It helps the texture, but it can feel drying for some skin.
How should I start?Twice a week at night, buffered with moisturizer, then build up slowly.
Full ingredient list+

Cyclopentasiloxane, Squalane, Water, Retinol, Tocopheryl Acetate, Ascorbyl Palmitate, Bisabolol, Lecithin, Potassium Phosphate, Pentylene Glycol, Polysorbate 20, Alcohol

References+

1. An Innovative Dendrimer-Based Retinol Delivery System for Xerosis Care: Stability, Tolerance, and Sustained Hydration (https://www.mdpi.com/2077-0383/15/12/4435) — Encapsulation of retinol protects it from oxidation and UV/photodegradation and enables controlled/sustained release while remaining well tolerated with no signs of irritation, backing the page's claim that encapsulation shields retinol from air and light and slows release. 2. Prospective, randomized, double-blind assessment of topical bakuchiol and retinol for facial photoageing (https://academic.oup.com/bjd/article-abstract/180/2/289/6601687) — In this randomized trial retinol users reported more facial skin scaling and stinging, supporting the page's claim that irritation such as redness, flaking and stinging is expected with retinol. 3. Efficacy and tolerability of a double-conjugated retinoid cream vs 1.0% retinol cream or 0.025% tretinoin cream in subjects with mild to severe photoaging (https://pubmed.ncbi.nlm.nih.gov/28762645/) — Documents that topical retinoids are efficacious for photoaging but irritating, and that 1.0% retinol induced measurable erythema, supporting that irritation accompanies retinol use rather than being a sign it is 'working.' 4. Molecular mechanisms of photoaging and its prevention by retinoic acid: ultraviolet irradiation induces MAP kinase signal transduction cascades that induce AP-1-regulated matrix metalloproteinases that degrade human skin in vivo (https://pubmed.ncbi.nlm.nih.gov/9732061/) — Explains the biological mechanism by which retinoic acid (the active metabolite of retinol) works in skin, inhibiting UV-induced matrix metalloproteinases that degrade collagen, underpinning retinol's role as an active anti-aging retinoid.