This is the second article in the LJO Explains series — a glossary of cosmetic terms, decoded honestly. Because understanding what is on your label is the first step to understanding what is on your skin.

Open any beauty magazine or scroll through a skincare brand's Instagram and you will encounter a parade of impressive-sounding ingredients. Antioxidants. Peptides. Polyphenols. Retinoids. Phytochemicals. Each one promises transformation — younger skin, fewer lines, a more radiant complexion.

But what do these terms actually mean? How do they work? And which ones are genuinely present in the products you already use — perhaps without knowing it?

This instalment of LJO Explains decodes the language of active ingredients — the compounds in skincare that do the most work.

Antioxidant

What it means: An antioxidant is a compound that neutralises free radicals — unstable molecules that damage skin cells, accelerate aging, and contribute to a dull, uneven complexion. Free radicals are generated by UV exposure, pollution, stress, and the natural metabolic processes of the body.

How it works: Free radicals are missing an electron. They stabilise themselves by stealing electrons from healthy skin cells — a process called oxidative stress. Antioxidants donate electrons to free radicals, neutralising them before they can cause damage.

Common antioxidants in skincare: Vitamin C (ascorbic acid), Vitamin E (tocopherol), Vitamin A (retinol), polyphenols, resveratrol, coenzyme Q10, and certain plant extracts.

Le Joyau d'Olive: Virgin olive oil is naturally rich in antioxidants — particularly vitamin E (tocopherol) and oleuropein, a phenolic compound unique to the olive. These antioxidants are preserved intact through our cold saponification process, remaining active in every bar of Le Joyau d'Olive soap.

Anti-Inflammatory

What it means: An anti-inflammatory ingredient reduces redness, swelling, heat, and irritation in the skin — calming the immune response that causes these symptoms.

Why it matters: Chronic low-grade inflammation in the skin — sometimes called "inflammaging" — is increasingly recognised as a primary driver of premature skin aging. Conditions like rosacea, eczema, and acne all have inflammation at their core.

Common anti-inflammatory skincare ingredients: Oleic acid, niacinamide, centella asiatica, green tea extract, chamomile, aloe vera, and omega fatty acids.

Le Joyau d'Olive: Oleic acid — the dominant fatty acid in virgin olive oil, comprising approximately 70–80% of its composition — has well-documented anti-inflammatory properties. Multiple clinical studies have shown it to reduce inflammatory markers in skin tissue. Our soaps are inherently anti-inflammatory — not through added active ingredients, but through the nature of the base oil itself.

Antimicrobial / Antibacterial

What it means: An antimicrobial ingredient inhibits or kills microorganisms — including bacteria, fungi, and viruses — on the skin surface. Antibacterial ingredients specifically target bacteria.

Why it matters: The skin hosts a complex community of microorganisms — the skin microbiome — that plays a crucial role in immune function and skin health. Effective antimicrobial skincare targets harmful pathogens without disrupting the broader microbiome. This is a crucial distinction: overly aggressive antimicrobial products can strip the skin's beneficial bacteria, worsening conditions like eczema and acne in the long term.

Common natural antimicrobials: Tea tree oil, lavender essential oil, thyme, rosemary, oregano, and certain plant-derived phenols.

Le Joyau d'Olive: Several of our essential oil variants have natural antimicrobial properties. Lavender Whisper contains linalool — a compound with clinically documented antibacterial activity. Musk & Oud Paradise contains antibacterial compounds from musk seed extract. Pine Charisma contains alpha-pinene — a terpene with antifungal and antibacterial properties.

Antifungal

What it means: An antifungal ingredient inhibits the growth of fungi — including the yeasts and moulds that can cause skin conditions such as athlete's foot, ringworm, and certain forms of dandruff.

Common natural antifungals: Tea tree oil, lavender oil, oregano oil, thyme, and certain fatty acids including caprylic acid.

Le Joyau d'Olive: Pine Charisma — formulated with pine leaf essential oil — contains alpha-pinene and beta-pinene, terpenes with documented antifungal activity. This makes it particularly well-suited for foot care and for skin prone to fungal conditions.

Antiseptic

What it means: An antiseptic is a substance applied to living tissue to prevent infection by reducing the presence of microorganisms. Unlike antibiotics (which work systemically), antiseptics work on the skin surface.

Common antiseptics: Alcohol, hydrogen peroxide, iodine, chlorhexidine, and certain plant-derived essential oils.

Important distinction: Antiseptics are different from disinfectants, which are used on non-living surfaces. The distinction matters for understanding the appropriate use and concentration of each.

Photoprotective

What it means: A photoprotective ingredient protects the skin from the damaging effects of ultraviolet (UV) radiation — including sunburn, premature aging (photoaging), and increased risk of skin cancer.

Two types:

  • UV filters — either absorb UV radiation (chemical filters) or reflect it (physical/mineral filters such as zinc oxide and titanium dioxide)
  • Photoprotective antioxidants — neutralise the free radicals generated by UV exposure, reducing oxidative damage even when UV filters are not present

Le Joyau d'Olive: Our soaps are not sunscreens and should not replace SPF products. However, the antioxidants naturally present in virgin olive oil — particularly vitamin E — provide a degree of photoprotective activity by neutralising UV-induced free radicals. This is a supporting function, not a primary one.

Retinoid

What it means: Retinoids are a family of compounds derived from Vitamin A. They are among the most clinically studied and proven active ingredients in skincare — with documented efficacy in stimulating cell renewal, increasing collagen production, reducing the appearance of fine lines, and improving skin texture and tone.

The retinoid family: Retinol (available over the counter), retinaldehyde, retinyl esters (gentler forms), and tretinoin (prescription-strength, also known as retinoic acid).

Important considerations: Retinoids increase skin sensitivity to UV radiation — making daily SPF application essential during use. They can cause initial irritation, dryness, and peeling — particularly at higher concentrations. Not recommended during pregnancy.

Le Joyau d'Olive: Virgin olive oil contains beta-carotene — a precursor to Vitamin A — as well as naturally occurring tocopherols. While not retinoids in the clinical sense, these compounds contribute to the skin-renewing properties that make olive oil such an enduring skincare ingredient.

Phytochemical

What it means: A phytochemical is a bioactive compound derived from plants. Plants produce thousands of phytochemicals — including flavonoids, terpenes, phenols, and alkaloids — as part of their own defence mechanisms against disease, UV radiation, and environmental stress.

Why they matter for skin: Many phytochemicals have direct benefits for human skin — including antioxidant, anti-inflammatory, antimicrobial, and UV-protective properties. The study of phytochemicals for cosmetic use is one of the most active areas in dermatological research.

Le Joyau d'Olive: Every essential oil in our collection is a rich source of phytochemicals — from the linalool in lavender to the oleuropein in olive oil, the limonene in orange blossom, and the alpha-pinene in pine leaf. These are not added actives; they are intrinsic to the plants from which our ingredients are drawn.

Polyphenol

What it means: Polyphenols are a large family of plant-derived phytochemicals characterised by multiple phenol units in their molecular structure. They are among the most potent natural antioxidants known — and are increasingly studied for their anti-aging, anti-inflammatory, and skin-protective properties.

Common polyphenols in skincare: Resveratrol (from grapes), EGCG (from green tea), curcumin (from turmeric), ellagic acid (from pomegranate), and oleuropein (from olive).

Le Joyau d'Olive: Two of our most significant polyphenol sources are olive oil (oleuropein and hydroxytyrosol — among the most potent antioxidant polyphenols found in any plant) and green tea (EGCG — epigallocatechin gallate — extensively studied for its anti-aging and anti-inflammatory properties). Our Green Tea Mystique soap combines both.

Peptide

What it means: Peptides are short chains of amino acids — the building blocks of proteins. In skincare, peptides are used to signal the skin to perform specific functions: stimulating collagen and elastin production, improving skin firmness, reducing the appearance of wrinkles, and supporting the skin's repair processes.

How they work: Certain peptides mimic the fragments of collagen that are released when collagen breaks down — signalling the skin that it needs to produce more. Others block the neurotransmitter signals that cause muscle contractions, reducing expression lines (sometimes called "botox-like" peptides).

Common peptides in skincare: Matrixyl (palmitoyl pentapeptide-4), Argireline (acetyl hexapeptide-3), copper peptides, and collagen-stimulating peptides.

Le Joyau d'Olive: Our soaps do not contain isolated synthetic peptides — but the amino acids naturally present in virgin olive oil and the glycerol produced during saponification provide a nourishing foundation that supports the skin's natural protein synthesis. True skin health begins with a clean, intact barrier — and that is where Le Joyau d'Olive starts.

In Summary

The language of active ingredients can make skincare feel like a pharmaceutical science — and to some extent, it is. The skin is a complex organ, and the compounds that interact with it are genuinely sophisticated.

But complexity is not always the answer. Some of the most effective and well-studied actives in skincare — oleic acid, vitamin E, polyphenols, natural antimicrobials — are found in their most concentrated and bioavailable form in a single ingredient: virgin olive oil.

At Le Joyau d'Olive, we did not add these actives. We built our soap around an oil that already contains them — as it has for four thousand years.

This is part of the LJO Explains series — a glossary of cosmetic terms, decoded honestly.
Next in the series: LJO Explains: Saponification, Surfactant, pH Balance — The Science Behind What's in Your Bottle