Blog - sk.in - skin ingredients

Why Spring Light Reveals What Winter Left on Your Skin

Thursday, 17 September 2026 by Dr Alek Nikolic

Spring light is higher in angle, cooler in colour temperature, and more directional than winter light, making surface texture, pigmentation, and dullness far more visible. Winter skin accumulates dead cell build-up, reduced circulation, and cumulative environmental stress. Spring simply provides the lighting conditions to reveal what was already there.

Published in Seasonal Skincare, sk.in gloss

No Comments

Why sk.in bounce | combo shot Is the Structural Foundation of a Radiant Result

Tuesday, 01 September 2026 by Dr Alek Nikolic

sk.in bounce | combo shot is formulated around HPR (Hydroxypinacolone Retinoate), a retinoid ester that supports cellular turnover with lower irritation potential than traditional retinol. In independent 8-week instrumental testing at Luamed (Slovenia, 2019), it helped reduce the appearance of pigmentation and supports skin elasticity, addressing the structural conditions that underpin a visibly radiant result.

best night serum for firmness best serum for pores and texture best serum for skin elasticity firming serum for mature skin how to improve skin firmness how to reduce appearance of pores HPR vs retinol retinoid serum for elasticity serum for structural skin support what causes loss of skin elasticity

Published in sk.in bounce

No Comments

Why Autumn Light Reveals What Your Skin Is Really Reflecting

Tuesday, 01 September 2026 by Dr Alek Nikolic

Autumn light arrives at a lower angle than summer sun, casting raking illumination across the skin's surface rather than flooding it from above. This directional quality exposes texture, uneven tone, and pigmentation that flatter summer light conceals. The result is a clearer view of what your skin has actually accumulated over the warmer months.

antioxidant serum benefits autumn skin dullness causes best serum for uneven skin tone best vitamin C serum for pigmentation best vitamin C serum for radiance how does vitamin C serum work how to reduce appearance of pigmentation lipid soluble vitamin C benefits niacinamide for skin tone why does skin look dull in autumn

Published in Seasonal Skincare

No Comments

The Glow Serum Explained: What Actually Makes Skin Look Radiant

Tuesday, 01 September 2026 by Dr Alek Nikolic

A glow serum supports skin radiance by addressing the structural and surface conditions that determine how skin reflects light. Effective formulations combine hydration at multiple skin depths, surface renewal, and barrier integrity. Radiance is not a cosmetic effect applied on top of skin, it is an outcome of how well the skin beneath is functioning.

best serum for glowing skin glow serum benefits how to achieve radiant skin naturally how to get glowing skin how vitamin C fits a radiance routine hyaluronic acid for glowing skin skin radiance ingredients what is a glow serum what makes skin look radiant why does skin look dull

Published in sk.in, sk.in gloss

No Comments

Tapering Retinoid Frequency: The HPR Spring Protocol

Tuesday, 04 August 2026 by Dr Alek Nikolic

tapering-retinoid-frequency-hpr-spring-protocol

In spring, tapering retinoid frequency reduces the risk of UV-sensitised irritation while maintaining cellular turnover. Switching from nightly retinol to a once- or twice-weekly application of HPR (Hydroxypinacolone Retinoate) preserves efficacy, supports barrier integrity, and aligns with the skin's seasonal recalibration needs.

how often should you use a retinoid how to introduce a high strength retinoid how to use a retinoid once a week HPR vs traditional retinol Hydroxypinacolone Retinoate benefits retinoid skincare mistakes to avoid retinoid with lower irritation than retinol signs you are using a retinoid too often weekly retinoid treatment when to move up retinoid strength

Published in Retinol

No Comments

Why Spring Is the Window to Build Antioxidant Habits

Tuesday, 04 August 2026 by Dr Alek Nikolic

Spring is the optimal time to build antioxidant habits because UV intensity is rising but not yet at its summer peak, giving skin time to adapt to actives like vitamin C before cumulative environmental stress increases. Establishing a consistent antioxidant serum routine in spring means skin is better supported when summer conditions arrive.

AM skincare routine vitamin C antioxidant serum before summer best antioxidant serum for skin does vitamin C make skin sun sensitive how to use vitamin C serum niacinamide and vitamin C serum vitamin C serum spring routine why antioxidants matter in spring skincare why use vitamin C serum in spring

Published in Seasonal Skincare

No Comments

The sk.in Guide to Your Spring Skincare Routine

Tuesday, 04 August 2026 by Dr Alek Nikolic

A spring skincare routine has two layers: a daily foundation that runs every morning and evening, and a weekly treatment layer introduced once the daily foundation is settled. The daily layer anchors hydration and cellular turnover. The weekly layer introduces targeted actives. Neither layer should be introduced simultaneously.

daily skincare routine vs weekly treatment doctor formulated skincare routine how to build a spring skincare routine how to introduce a new active into your routine how to layer skincare actives morning and evening skincare routine spring skincare checklist spring skincare mistakes to avoid spring skincare routine South Africa weekly skincare treatment layer

Published in Seasonal Skincare

No Comments

Avoiding Ingredient Conflicts: What Not to Mix in Your Skincare Routine

Tuesday, 07 July 2026 by Dr Alek Nikolic

Certain skincare ingredient combinations reduce efficacy, destabilise actives, or compromise barrier integrity. The most clinically significant conflicts involve acids with retinoids, vitamin C with niacinamide at high concentrations, and multiple exfoliating actives used simultaneously. Understanding these interactions is the foundation of layering intelligence.

ingredient conflicts skincare, what not to mix skincare, skincare ingredient combinations to avoid, active ingredient interactions

Published in sk.in ingredients, Skin Ingredients

No Comments

Understanding Active Ingredient Concentrations in Skincare

Tuesday, 07 July 2026 by Dr Alek Nikolic

Active ingredient concentrations determine how effectively a skincare product performs. A higher percentage does not always mean better results — efficacy depends on the active's threshold concentration, its pH environment, molecular weight, and ingredient compatibility. Precision dosing, not maximum strength, is the standard by which formulation quality should be judged.

active ingredient concentrations, skincare percentages, serum potency, precision dosing, ingredient efficacy

Published in sk.in ingredients, Skin Ingredients

No Comments

How to Read a Skincare Ingredient List: Dr Alek Explains

Tuesday, 07 July 2026 by Dr Alek Nikolic

A skincare ingredient list is written in INCI order, from highest to lowest concentration. Ingredients above 1% appear in descending order of volume; those at or below 1% may appear in any order. Reading this list tells you what actives are present, roughly how concentrated they are, and whether the formulation is likely to deliver on its claims.

active ingredients in skincare decode skincare ingredients how to read a skincare ingredient list how to read serum ingredients how to read skincare labels INCI list explained skincare ingredient list explained skincare label meaning understanding skincare ingredients what's in my serum

Published in sk.in ingredients, Skin Ingredients

No Comments

SIGN IN YOUR ACCOUNT TO HAVE ACCESS TO DIFFERENT FEATURES

FORGOT YOUR DETAILS?