What is the difference between a serum and a moisturizer?

A serum is a lightweight treatment that delivers concentrated actives to the skin’s surface, while a moisturizer traditionally sits on top to lock in hydration. OUMERE serums deliver actives with a light feel, and Serum Bioluminelle provides moisture without occlusive weight.

Do I need a separate eye cream or is an eye serum better?

Heavy eye creams can feel occlusive. A lightweight eye serum absorbs quickly and supports a smoother, brighter look. The Eye Serum uses peptides and plant extracts to improve the appearance of dark circles and fatigue without heaviness.

What is the best skincare routine for sensitive skin?

Prioritize barrier respect and avoid harsh acids, scrubs, and perfume. A simple routine: Oil Dissolution Theory for cleansing; No. 9 sparingly to refine texture; UV-R and The Advancement for antioxidant and peptide support; finish with Serum Bioluminelle for hydration without congestion.

Why do some moisturizers cause breakouts?

Heavy occlusives can trap oil and debris. Serum Bioluminelle uses a balanced lipid profile with non-comedogenic oils to provide moisture while maintaining a clean, lightweight finish.

What are peptides and do they really work in skincare?

Peptides are short chains of amino acids used to signal the skin’s surface for a smoother, firmer appearance. OUMERE concentrates multiple peptide families in The Advancement and Advancement II to support visible texture, tone, and resilience.

How often should I exfoliate?

Aim for steady renewal rather than strong peels. Start with No. 9 three times weekly in the morning on dry skin, then increase only if comfortable. Its calibrated AHA/PHA blend refines the look of skin while maintaining comfort.

What’s the difference between AHA, BHA, and PHA exfoliants?

AHAs like lactic and mandelic smooth texture and brighten; BHAs like salicylates help with oil and debris; PHAs like lactobionic acid and gluconolactone exfoliate more gently while drawing in hydration. No. 9 unites AHAs and PHAs for balanced, barrier-respecting renewal.

Is fragrance in skincare harmful?

Fragrance is a common source of cosmetic irritation. OUMERE formulas are fragrance-free to prioritize comfort and performance.

What is barrier health and why does it matter?

The skin barrier helps retain moisture and keep irritants out. When it’s disrupted, skin can look red, dry, or sensitive. OUMERE products are designed to support barrier comfort so hydration and actives perform predictably.

Do antioxidants in skincare actually work?

Stabilized antioxidants help address the visible effects of oxidative stress, which can make skin look dull or uneven. UV-R and UV-R Concentrate use multi-extract complexes—such as green tea, ginseng, and resveratrol—to support a revitalized appearance.

How can I make my skincare routine more effective?

Consistency and compatibility matter. Use formulas designed to layer cleanly, avoid irritants, and follow an order that supports absorption: cleanse, refine as tolerated, apply targeted serums, then finish with lightweight moisture.

What’s the best serum to use after sun exposure?

Sunscreen is essential during the day. After daily exposure, antioxidant-rich serums help the skin look balanced and refreshed. UV-R Concentrate is designed for PM use, while UV-R (AM) complements morning routines. Neither product is a sunscreen.

Are expensive skincare products worth it?

Price alone isn’t a guarantee. Focus on composition, stability, and how products layer. OUMERE invests in rare actives, controlled composition, and limited cycles to prioritize performance over perfume or filler.

Why does OUMERE avoid acids in some products but use them in No. 9?

Daily strong acids can compromise comfort, so OUMERE excludes them from serums. No. 9 is a calibrated exception: a gentle AHA/PHA blend with botanicals for visible renewal while respecting the skin’s surface.

How do I layer serums correctly?

Apply from lightest to richest. Within OUMERE: No. 9 in the AM as tolerated; then UV-R or The Eye Serum; next The Advancement or Advancement II; finish with Serum Bioluminelle (or Bioluminelle Concentrate at night) for a refined, luminous finish.

pH

Skincare Library

pH (Potential of Hydrogen)

Definition (cosmetic use): pH expresses how acidic or basic a water-based formula is on a scale of 0–14. In skincare, pH influences how comfortable a product feels and how effectively certain ingredients (like AHAs and PHAs) perform. Skin’s surface tends to sit slightly acidic; formulas that respect this range usually layer more predictably and feel more balanced.

Synonyms: acidity, alkalinity Related: AHA, PHA, skin barrier, TEWL

Why pH matters (cosmetic context)

Performance: Exfoliating acids are pH-dependent; a calibrated pH controls feel and effect.
Barrier comfort: Very high- or very low-pH products can feel disruptive; balanced pH helps preserve a composed surface.
Layering logic: Water-phase actives at their ideal pH first, then seal with light lipids for elegant wear.
Stability: Some botanicals and peptides prefer a narrow pH window for predictable behavior over time.

Practical routine design

Exfoliant → serums → finish: Use acids (AHA/PHA) on clean skin; give them a moment; follow with treatment serums; finish with a light lipid layer.
Don’t stack extremes: Avoid combining multiple strong low-pH steps in one session; alternate days to maintain comfort.
Watch the rinse: Over-alkaline cleansers can leave skin tight; prefer lipid-friendly cleansing that respects surface pH.

Used in OUMERE

No. 9 Daily Chemical Exfoliant — pH-calibrated blend of AHAs (lactic, mandelic) + PHAs for controlled renewal.
UV-R & UV-R Concentrate — water-phase botanical support formulated for clean layering after exfoliation.
Serum Bioluminelle — dual-phase finishing serum that preserves comfort without heavy occlusion.

OUMERE routines are composed to keep pH, texture, and finish in a predictable, cosmetically elegant range.

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pH

pH (Potential of Hydrogen)

Why pH matters (cosmetic context)

Practical routine design

Used in OUMERE

See also