✅ High-strength 4% retinol for experienced users
✅ Targets fine lines, wrinkles and uneven skin texture
✅ Supports skin cell renewal for visibly smoother skin
✅ Suitable for ages 35+ or those with retinol tolerance
✅ Results typically visible after 6–8 weeks of consistent use

What Is 4% Retinol?

Retinol is a form of Vitamin A that encourages skin cell turnover — one of the most well-researched anti-ageing ingredients available. The percentage refers to the concentration of retinol in the formula. At 4%, this is a high-strength serum designed for those who have already built a tolerance to lower concentrations and are ready to progress their routine.

To put it in context: 0.25–0.5% is considered entry-level, 1–2.5% is mid-strength, and 3.5–5% is high-strength. The Ammuri 4% Retinol Serum sits firmly in the advanced category.

What It Does

• Encourages skin cell turnover to reveal fresher, smoother skin
• Helps reduce the visible appearance of fine lines and deeper wrinkles
• Improves skin texture and minimises the look of enlarged pores
• Supports fading of post-acne marks and uneven skin tone over time
• Promotes a firmer, more refined complexion with consistent use

Who Should Use 4% Retinol?

This serum is best suited to:

• Those who have used retinol at lower strengths (1–2.5%) and want to progress
• Skin aged 35+ where deeper wrinkles and significant renewal are the goal
• Anyone dealing with persistent skin texture, enlarged pores, or stubborn fine lines
• Those who have not experienced significant irritation at lower retinol concentrations

If you are new to retinol, we recommend starting with a lower strength and building up gradually before introducing a 4% formula.

4% Retinol vs 2.5% vs 5% — Which Strength Is Right for You?

2.5% Retinol — A good mid-strength option for those who have used retinol for 3–6 months and want to step up from beginner concentrations. Effective for early fine lines and general skin renewal with lower risk of irritation.

4% Retinol (this product) — High-strength, for experienced retinol users. Delivers more intensive skin renewal and is better suited to deeper wrinkles, significant texture concerns, and mature skin. Requires a gradual introduction even for experienced users.

5% Retinol — Maximum strength, best reserved for those with well-established retinol tolerance. Delivers the most intensive results but carries the highest risk of initial dryness or sensitivity during the adjustment period.

How to Use

1. Apply to clean, dry skin in the evening only
2. Use a pea-sized amount across the face — less is more at this strength
3. Start 2 nights per week and increase gradually as your skin adjusts
4. Follow with a gentle moisturiser to support the skin barrier
5. Always apply SPF the following morning — retinol increases photosensitivity

Patch test before first use. Apply a small amount to the inner arm and wait 24 hours before applying to the face.

Frequently Asked Questions

Is 4% retinol strong?
Yes — 4% retinol is considered a high-strength concentration. It is significantly more potent than the 0.25–1% formulas commonly found in high street skincare. It is intended for those who have already built a tolerance to retinol at lower strengths. If you are new to retinol, starting at a lower concentration is advisable to allow your skin to adjust gradually.

Can I use 4% retinol every night?
Not immediately. Begin with 2 nights per week and increase to every other night, then nightly, as your skin builds tolerance. Rushing this process can lead to dryness or sensitivity.

Will 4% retinol cause skin purging?
Some users experience an initial adjustment phase of 2–4 weeks as cell turnover accelerates. This is a normal response and typically settles as the skin adapts to the formula.

Do I need SPF when using retinol?
Yes — daily SPF is essential when using any retinol product. Retinol increases the skin’s sensitivity to UV exposure, which can counteract the benefits and increase the risk of pigmentation.

Pairs Well With

For a complete anti-ageing routine, pair with the Ammuri Vitamin C Day Cream SPF50 each morning. Explore the full Anti-Ageing Serums Collection.