FAQs
Q1. What is Hydroxypinacolone Retinoate (HPR) in iS Clinical Retinol+ Emulsion and how does it differ from regular Retinol?
A1. Hydroxypinacolone Retinoate is a retinoid ester of retinoic acid — the biologically active form of Vitamin A. Regular Retinol must be converted in two enzymatic steps (retinol → retinaldehyde → retinoic acid) before it can bind to retinoid receptors and produce anti-ageing effects. HPR bypasses these conversion steps and binds directly to retinoid receptors (RAR) at lower concentrations, with clinical studies suggesting comparable efficacy to Retinol at substantially lower irritation risk. Combining encapsulated Retinol and HPR in iS Clinical Retinol+ Emulsion creates a dual-retinoid system with both immediate (HPR) and sustained (encapsulated Retinol with controlled release) retinoid activity.
Q2. What does Bakuchiol contribute alongside Retinol in this formula?
A2. Bakuchiol is a plant-derived meroterpene phenol from Psoralea corylifolia seeds that activates retinoid receptor signalling through a mechanism independent of the classical retinoid pathway — clinical trials have shown comparable collagen stimulation and anti-wrinkle efficacy to 0.5% Retinol with significantly less photosensitivity and irritation. In iS Clinical Retinol+ Emulsion 0.3, Bakuchiol serves as a complementary retinoid-pathway activator that amplifies the formula's overall anti-ageing efficacy while moderating the irritation threshold — making the combination more tolerable than pure-Retinol formulas at equivalent effect.
Q3. Who should use iS Clinical Retinol+ Emulsion 0.3 and who should not?
A3. The 0.3% concentration is appropriate for adults who have previously used retinol products and tolerate them, or experienced users beginning with the lower concentration of the iS Clinical Retinol range before stepping up to higher concentrations. It is not recommended for retinoid-naive users who have never used retinol before — start with a lower concentration (0.1–0.25%) from another brand and build tolerance first. It is not recommended during pregnancy or breastfeeding. Those with active eczema, rosacea, or rosacea-prone skin should consult a dermatologist before use, as the retinoid combination may trigger a flare.
Q4. What is Ectoin in this formula and what does it do?
A4. Ectoin is a naturally occurring amino acid derivative produced by extremophile bacteria to protect their cellular proteins and DNA from extreme environmental conditions. In skincare, it acts as a molecular shield: it forms a hydration shell around cellular structures and proteins, protecting them from UV stress, heat stress, and inflammatory mediator damage. In iS Clinical Retinol+ Emulsion 0.3, Ectoin helps buffer the retinoid-related cellular stress response, reduces the skin's inflammatory reaction to the formula's active ingredients, and contributes to the skin's resilience during the adaptation period — directly addressing the tolerability challenges common in retinol emulsions.
Q5. How should iS Clinical Retinol+ Emulsion 0.3 be introduced into an evening routine?
A5. Apply a pea-sized amount to completely dry skin in the evening, two to three nights per week for the first three to four weeks. Apply after cleansing and allow to fully absorb before applying a Sheald Recovery Balm or moisturiser on top. Never apply to damp skin — moisture significantly increases retinoid absorption and irritation risk. Avoid other exfoliants, acids, and Vitamin C on the same evenings. Always use broad-spectrum SPF 30 or above every morning while using any retinoid. Progress to four to five nights per week, then nightly use, only if the skin shows minimal redness, dryness, or peeling at the previous frequency.