Essential Oils vs. Fragrance Oils

Essential oils are plant-derived concentrates extracted through steam or water distillation. Fragrance oils are synthetically manufactured in labs and can represent over 200 undisclosed chemical compounds under a single ingredient label. Prep U products use only the former.

The distinction matters — especially on a label. "Fragrance" as a standalone ingredient is a legal catch-all that can conceal dozens of synthetic chemicals, including phthalates and other sensitizers that don't have to be individually disclosed. Understanding the difference between these two ingredient categories takes about two minutes and changes how you read every personal care label going forward.

The Core Difference: Natural vs. Synthetic Origin

Essential oils are naturally occurring. They're the concentrated aromatic compounds found in plant material — in roots, flowers, stems, leaves, and bark — and are extracted through physical distillation processes, most commonly steam or cold pressing. The resulting oil is the plant's own chemistry, concentrated. Fragrance oils are manufactured. They're synthetic compounds created in laboratories by chemists specifically to produce a target scent, and they can contain any number of individual chemicals — some naturally-derived, some fully synthetic — combined to achieve the desired smell. The two categories have entirely different origins, entirely different ingredient compositions, and entirely different regulatory disclosure requirements. Essential oils require disclosure by plant name; fragrance oils can hide their full composition behind a single word.

What Fragrance Oils Actually Are — and Why They're So Prevalent

Fragrance oils dominate conventional personal care primarily because of cost. A synthetic fragrance compound can be manufactured to precisely mimic any scent at a fraction of the cost of the natural plant-derived equivalent. The regulatory framework in the United States allows all fragrance compounds to be listed under the single ingredient "fragrance" or "parfum," protecting proprietary formulas from disclosure. In practice, this means a product listing "fragrance" as an ingredient could contain anywhere from a few to over 200 individual chemical compounds, none of which the consumer can identify from the label. Some of these compounds — particularly phthalates, which are used to stabilize synthetic fragrance and extend longevity — are classified as endocrine disruptors. For teen boys whose hormonal systems are actively developing during puberty, daily skin exposure to undisclosed endocrine-disrupting compounds from synthetic fragrance is a reasonable concern to address by choosing differently.

What Essential Oils Are and How They're Made

Essential oils are produced through distillation — most commonly steam distillation, in which steam is passed through plant material, vaporizing the aromatic compounds, and then condensed back into liquid form, separating the oil from the water. Cold-press extraction is used for citrus oils (bergamot, grapefruit, lemon, orange peel), where the rinds are mechanically pressed to release the oil directly. The resulting product is a concentrated plant oil that contains the characteristic compounds responsible for the plant's scent and biological properties. Tea tree oil (Melaleuca alternifolia) is produced this way and carries the actual antibacterial terpenes — primarily terpinen-4-ol — responsible for its documented antimicrobial effects. Lavender (Lavandula angustifolia) contains linalool and linalyl acetate, which contribute to its soothing and anti-inflammatory properties. These are known, named compounds — not a catch-all hiding hundreds of undisclosed chemicals.

Why the Difference Matters for Teen Skin

The concern with synthetic fragrance on teen skin is twofold. First, disclosure: you can't evaluate what you can't identify. When a product lists "fragrance," there's no way to know whether it contains phthalates, specific sensitizers, or other compounds worth avoiding without accessing the brand's proprietary formula. Second, biological timing: teen bodies during puberty are in a period of heightened endocrine activity and increased skin permeability. Daily exposure to undisclosed synthetic compounds during this window carries more weight than the same exposure in adulthood. "Fragrance" as a label ingredient is also the most common source of contact dermatitis and allergic skin reactions in teens — largely because the dozens of compounds it can represent include known allergens. Choosing essential-oil-based scent eliminates the disclosure problem entirely: every compound is named, and the source is identifiable.

How Essential Oils Function in Prep U Products

Prep U's scent formulas use named essential oils selected for both fragrance and functional properties. Tea tree oil (Melaleuca alternifolia) contributes antibacterial activity relevant to body odor control and acne-prone skin care. Lavender (Lavandula angustifolia) provides anti-inflammatory and calming properties alongside its scent. Citrus oils — bergamot, grapefruit, lemon peel — provide fresh, clean fragrance notes from cold-pressed citrus rinds. Each essential oil is listed by its INCI botanical name on the ingredient list, not hidden under "fragrance." This is the standard Prep U holds across all scented formulas — Solstice Deodorant, Solstice Body Wash, and others. The 91% SkinSAFE rating on scented formulas independently confirms the absence of the most common synthetic sensitizers.

How to Identify Which Type a Product Uses

Distinguishing essential oils from fragrance oils on a label is simple once you know what to look for. Essential oils appear as botanical names: Melaleuca alternifolia (tea tree), Lavandula angustifolia (lavender), Citrus aurantium (bergamot). They may also appear as common names followed by the botanical in parentheses. Fragrance oils appear as a single catch-all word: "fragrance," "parfum," or "fragrance oil." That single entry, regardless of how natural the product's branding looks, can represent any number of undisclosed synthetic compounds. The scan takes five seconds on any label: find the scent source, check whether it's a named botanical or a catch-all. If it's a named botanical, the scent is essential oil-based. If it says "fragrance," it's synthetic.

When choosing products for yourself or your teen, the scent source is one of the most revealing data points on the label. Named essential oils mean transparency; "fragrance" means anything could be behind it.

Last reviewed June 2026 by the Prep U team.

*Information on this site is intended for educational and informational purposes only. Any information on this site is not intended to make claims to any unique individual and/or experience.

For more, see our guide to the natural deodorant for boys.