The Journal

Opinion

The case for a boring skincare shelf

After twenty-two winters of growing herbs and watching hands, a grower argues the kindest routine is the one you stop changing.

Long Read

• Skin

Rosehip

Rosehip oil for your face: what it can and can’t do

Rosehip oil has components that plausibly help dry, rough skin and may aid wound-related healing in lab and animal work; human evidence for scars, stretch marks and aging is limited and often comes from combinations or oral products rather than straight topical oil.

Research Desk

• Hair

Pumpkin seed

Pumpkin seed oil and thinning hair

One randomized, placebo‑controlled trial found men taking oral pumpkin seed oil capsules had a meaningful hair‑count gain; animal studies and small topical trials add plausible mechanisms but do not settle whether rubbing oil on your scalp will help. Evidence is suggestive but thin and largely unreplicated.

Evidence Check

• Skin
• Body

Oat

Oat and colloidal oatmeal: the botanical dermatologists actually recommend

Colloidal oatmeal is one of the few botanicals with randomized trials and mechanistic lab work supporting its use for dry, itchy and eczema-prone skin. The strongest evidence is for formulated topical products containing colloidal oat or its extracts; many studies test finished products or combination formulas rather than isolated oat constituents.

Evidence Check

• Hair

Coconut

Coconut oil and hair breakage: one of the few oils with real data

Coconut oil is one of the few hair oils shown in lab work to penetrate the hair shaft and to reduce protein loss during washing. The support comes mainly from in‑vitro and small human observational work; large controlled clinical trials are still lacking.

Origins

• Skin
• Body

Calendula

Calendula: the marigold in your diaper cream, examined

Calendula officinalis (pot marigold) has long been used on wounds and rashes. Recent laboratory and animal work is extensive; human trials are small and formulation-dependent, so clinical conclusions are tentative.

Myth Busting

• Body

Body care

Body oil vs. lotion: which works better on damp skin

Oils don’t add water; they mainly block water loss. Moisturizers that work combine water-adding humectants with emollients and an occlusive. Clinical studies repeatedly show emollient-containing lotions or creams help dry or eczematous skin, but direct trials pitting a plain oil against a lotion applied to damp skin are sparse in this set of abstracts.

Evidence Check

• Skin
• Body

Tea tree

Tea tree oil: real antimicrobial, real allergy risk

Laboratory work and small clinical trials support tea tree oil’s antibacterial and antifungal activity, and a recent meta-analysis found topical tea tree reduced acne severity; reviews and formulation studies also warn of local irritation and stability problems. Current evidence is useful but limited, and safety concerns in topical use are repeatedly raised.

Index Explainer

• Body

Sweet almond

Sweet almond oil for massage and dry skin

Sweet almond oil is a light, commonly used carrier oil for massage whose cosmetic claims are modest and supported mainly by small human trials, formulation studies and narrative reviews. The evidence shows modest increases in skin hydration and benefits when almond oil is part of emollient products, but few studies test sweet almond oil on its own for body dryness or stretch marks.

Index Explainer

• Skin
• Body

Shea

Shea butter: why it works for dry skin

Shea butter works mainly as an occlusive lipid-rich butter with some minor bioactive components; clinical studies in babies and children and several small trials of mixed creams support its role as an effective emollient, but many trials test blends rather than shea alone.

Evidence Check

• Body

Rosehip

Rosehip oil for stretch marks: the trials, the blends and the caveats

A randomized, double-blind pregnancy trial found fewer new stretch marks in people who used a cream that included rosehip oil — but the product also contained several other actives, and the benefit was preventive rather than restorative.

Origins

• Hair

Scalp

Scalp oiling: tradition, trend and what the science says

Scalp oiling is an old care ritual whose modern popularity rests on texture, comfort and smell as much as any biological effect. Laboratory work shows coconut oil can change hair-fibre mechanics and has antibacterial activity in vitro; a randomized trial in preterm infants shows topical coconut oil increases skin moisture. Clinical evidence for scalp oiling specifically is thin.

Index Explainer

• Hair

Beard

Beard oils: what’s actually in them and what they do

Beard oils are mostly light carrier oils (jojoba, argan, sometimes castor) plus fragrance; as topical emollients they soften coarse facial hair and can reduce skin inflammation and itch, but there’s little direct human evidence that they make beards thicker or grow faster. (Evidence for moisturising and anti-inflammatory effects comes mainly from lab, animal and formulation studies.)

Myth Busting

• Hair

Argan

Argan oil for frizz: shine, not repair

Argan oil’s value for frizz is primarily cosmetic: its fatty acids and surface‑active lipids coat the hair, smooth the cuticle and add shine. The literature here shows compositional differences, processing effects, and antioxidant activity — useful context for styling — but not clinical proof that oil restores broken ends or structurally repairs hair.

Evidence Check

• Hair

Castor oil

Castor oil for brows and lashes: does it thicken anything?

The castor-oil-for-lashes story is mostly anecdote and small preclinical work; systematic reviews find no strong human evidence for hair growth, while product formulations sometimes hide stronger, drug-like ingredients that do have effects and safety concerns.

Research Desk

• Skin

Face oils

Face oils for oily skin: linoleic vs. oleic, ranked

The idea that 'linoleic oils are better for oily, acne-prone skin' rests largely on small lab studies and a few pilot clinical observations; the literature here is promising but mostly preclinical and frequently tests oils inside blends or nano‑formulations.

Evidence Check

• Skin
• Body

Aloe

Aloe vera: what the evidence says beyond sunburn

Aloe vera has more controlled human trials than many botanicals, but the strongest, most consistent signals are in wound‑care and post‑surgical healing rather than glamorous skin fixes. Much of the recent work is engineering (dressings, gels, vesicles) or preclinical; the human trials that exist are small and context‑specific.

Index Explainer

• Skin

Squalane

Squalane vs. squalene: the plant-derived moisturizer everyone mixes up

Squalene is a natural unsaturated lipid in skin oils that oxidizes; squalane is the hydrogenated, far more stable form used in cosmetics. The plant sources and stability issues behind that one-letter swap are mostly documented in laboratory and oil‑chemistry studies, with little direct human testing of squalane alone.

Index Explainer

• Skin
• Hair

Jojoba

Jojoba isn’t an oil, and why that matters for your skin

Jojoba is chemically a liquid wax made largely of wax esters, the same lipid class that contributes substantially to human sebum. That chemical kinship and jojoba’s compositional stability explain many of its practical advantages, but controlled human trials showing it ‘balances’ oil production are lacking.

Long Read

• Skin

Prickly pear

Prickly pear seed oil: the most expensive oil in your cabinet, examined

Prickly pear seed oil is chemically distinctive—very high in linoleic acid and γ-tocopherol—but most evidence for skin benefit comes from lab and animal work; robust human trials comparing it to cheaper oils are absent. (See composition and extraction studies.)

Myth Busting

• Skin

Castor oil

Castor oil and acne: why oil-cleansing advice goes wrong

Castor-heavy oil cleansing can remove makeup and even affect drug penetration, but the notion that castor oil ‘‘draws out’’ toxins or reliably clears acne is not supported by the research cited here. Evidence for helpful effects is patchy and mostly lab or formulation-level.

Evidence Check

• Skin

Castor oil

Castor oil on your face: cleanser, moisturizer or myth?

Most evidence for castor oil’s effects comes from laboratory work, formulation studies, ocular or oral/denture trials, and material science—not from controlled tests on facial skin. That makes its actions plausible but not precisely mapped to regular face use.

Origins

• Skin

Rosehip

From Andean hedgerows to vanity shelves: a short history of rosehip

Rosehip has long served as food and a wartime vitamin source in Europe; modern cosmetic interest rests on laboratory, animal and a few human studies that show antioxidant, anti-inflammatory and wound‑healing potential, but most topical claims still rest on preclinical work.

Index Explainer

• Skin

Face oils

How to use a face oil: before or after moisturizer, how many drops, when

A face oil is an occlusive finish: it doesn’t add water, it helps trap it. That makes it sensible as the last step on slightly damp skin. Lab work on rosehip and jojoba oils speaks to stability and safety; few studies test them alone as facial oils, so most practical rules come from how oils behave, not trials.

Research Desk

• Skin

Rosehip

Rosehip oil and dark spots: linoleic acid, vitamin A and pigmentation

Lab and animal work plus a few formulation studies point to plausible ways rosehip might influence pigmentation, but direct human evidence that rosehip oil by itself fades dark spots is very limited.

Index Explainer

• Skin

Rosehip

Cold-pressed vs. refined: how to tell good rosehip oil by color, smell and label

The pigments and fragile polyunsaturated fats that make rosehip oil amber, light and aromatic are easily lost in processing and storage. Lab studies of cold‑pressed rosehip oils show measurable carotenoids, tocopherols and volatile terpenes; a clear, scentless product often signals those components have been removed or reduced.

Evidence Check

• Skin

Rosehip

Will rosehip oil break you out? Comedogenicity, explained

Online 'comedogenic scores' are crude and dated; the best evidence on rosehip oil and breakouts comes from lab and animal studies, plus analyses of oil chemistry—not from controlled human trials of rosehip oil alone.

Myth Busting

• Skin

Rosehip

Rosehip, retinol and the “natural retinol” myth

Many product pages call rosehip oil “nature’s retinol.” The papers supplied here show rosehip as a source of carotenoids, vitamin C, tocopherols and PUFAs and include small in‑vitro and animal studies of wound healing, hair growth and antioxidant activity. They do not, in themselves, establish that rosehip contains meaningful retinoic acid or that it reproduces the clinical effects of pharmaceutical retinoids.

Evidence Check

• Skin

Rosehip

Does rosehip oil fade scars? What the surgical-scar trials found

Small human trials are the origin of rosehip oil’s scar reputation, but nearly all supporting work is laboratory or animal studies, or tests of formulations rather than straight comparisons in people. The evidence is suggestive but narrow.

Evidence Check

• Hair

Castor oil

Castor oil and your hairline: what the evidence actually says

Lab models and computer docking raise plausible mechanisms for ricinoleic acid, and some animal work and reviews note cosmetic benefits; but well-designed human trials showing topical castor oil reliably produces new scalp hair are not available in the cited literature.