Curology Custom FormulavsGeologie Personalized Skincare

Curology Custom Formula is a single nightly cream compounded with up to three prescription and cosmeceutical actives selected by a licensed dermatology provider after reviewing your online quiz and uploaded photos. The active most often included is tretinoin, a vitamin A retinoid that binds nuclear retinoic acid receptors to speed skin-cell turnover, help unclog pores, and over time support collagen production while reducing the matrix metalloproteinase enzymes that break down skin structure. Supporting actives may include azelaic acid (antibacterial, anti-inflammatory, brightening), niacinamide (barrier support, oil control, tone evening), clindamycin (a topical antibiotic for inflammatory acne), and depending on your concerns, tranexamic acid, metronidazole, zinc pyrithione, ivermectin, or spironolactone. Together they target acne, post-acne marks, texture, and early signs of aging. Note that Curology's specific multi-ingredient blends have not been studied as a single branded product; the evidence below is for the individual actives.

Geologie starts with a roughly 5-minute online quiz about your age, skin type, goals (wrinkles, dark spots, acne, dryness) and concerns. The company says formulas are developed and reviewed by dermatologists and chemists, then assigned across a small set of core products (face wash, day cream with SPF, retinol night cream, and optional eye cream or a targeted acne system). The bottles look similar, but the active ingredients and concentrations inside can differ by person. The actives do the real work: retinol speeds skin-cell turnover and stimulates collagen to soften fine lines; niacinamide supports the skin barrier and helps fade pigmentation; salicylic and azelaic acid exfoliate, reduce inflammation, and help curb acne; hyaluronic acid hydrates; and a vitamin C+E ferulic blend adds antioxidant protection. Notably, Geologie deliberately formulates without benzoyl peroxide.

The individual actives have strong peer-reviewed support, though Curology's specific multi-ingredient blends aren't tested as a branded product. In a 2025 Journal of Clinical Medicine review, tretinoin 0.05% lotion achieved treatment success (clear/almost clear plus a 2-grade improvement) in roughly 25-39% of acne patients at 12 weeks versus about 12-15% for vehicle, and a tretinoin-clindamycin combination reached about 46% success versus 31-33% for either alone. Tretinoin also consistently improves fine wrinkles, mottled pigmentation, and texture in randomized photoaging trials. For niacinamide, a 12-week double-blind study of a 5% topical formulation significantly improved fine lines, hyperpigmentation, and skin texture versus control, and a randomized trial of 4% nicotinamide performed similarly overall to 1% clindamycin for inflammatory acne (with results varying by skin type). A 2023 systematic review found azelaic acid significantly cut inflammatory lesions and erythema in acne and rosacea versus vehicle, though no eligible trials evaluated it for skin aging. Real-world results typically take 8-12 weeks of consistent use.

Geologie has not published its own large independent clinical trial, so efficacy rests on the well-established evidence for its individual actives. For retinol, a vehicle-controlled integrated analysis of six studies (471 participants; 237 retinol, 234 vehicle) reported significant improvement in signs of photoaging versus vehicle as early as week 4 and continuing through 12 weeks, with mild, transient irritation. A 2025 network meta-analysis in Scientific Reports (23 RCTs, 3,905 participants) likewise found topical retinol significantly improved fine wrinkles and hyperpigmentation, though prescription tretinoin and isotretinoin were generally stronger. For niacinamide, a peer-reviewed review (Antioxidants, 2021) summarizes dose-dependent clinical benefits, with niacinamide typically formulated at 4-5% and well tolerated, supporting hyperpigmentation, barrier repair (via increased ceramide synthesis), wrinkles, and redness over roughly 8-12 weeks. Independent reviewers (Medical News Today, 2025) found the formulas science-backed and generally effective, while noting results require consistent 2-3 month use and that some testers experienced irritation. Treat individual outcomes as variable.

The most common effects are mild and temporary: redness, dryness, flaking, peeling, stinging, and increased sun sensitivity, driven mainly by the tretinoin component. Many users also experience an initial "purge" where breakouts briefly worsen in the first few weeks as cell turnover accelerates; this usually settles. Per FDA tretinoin labeling, local reactions such as erythema (around 5%) and skin irritation/dermatitis (around 4%) are common and generally mild-to-moderate, peaking in the first two to three weeks and reversible on stopping. Serious reactions are uncommon with topical use, since systemic absorption of tretinoin is only about 1-2%. The most important safety issue is pregnancy: topical retinoids like tretinoin are not recommended, and spironolactone (a possible add-in) is contraindicated in pregnancy because of a risk of feminizing a male fetus. Start slowly, moisturize, use daily SPF, and contact a clinician for severe, blistering, or persistent reactions.

The most common issues come from the active ingredients, not Geologie specifically. Retinol can cause an adjustment period of redness, dryness, tightness, flaking, peeling, or temporary "purging" (a brief uptick in breakouts) that typically settles within one to a few weeks. Acids (salicylic, azelaic) and surfactants such as cocamidopropyl betaine may irritate sensitive skin; in one published review, some testers reported redness, rashes, dryness, or a burning sensation. Because retinol increases sun sensitivity, daily SPF is essential. Serious reactions are uncommon for a cosmetic, but stop use and seek care if you develop severe burning, swelling, blistering, or signs of an allergic reaction. Pregnant or breastfeeding individuals should avoid retinol-containing products.

As of 2026, Curology typically offers a free first month where you pay only shipping (about $5.45). After that, subscriptions generally run about $20 per month for a one-month supply (plus shipping) or roughly $40 every two months with free shipping, with bundled cleanser/moisturizer sets around $60. Independent testing by Innerbody reported a $35 one-time month and a $60 two-month subscription, so expect roughly $20-$40/month for the formula alone, depending on supply size and current promotions. Curology is a cash-pay service that is generally not billed directly to insurance; Curology states the Custom Formula may be HSA/FSA eligible depending on your plan, so check with your administrator. You can change ingredients or cancel anytime through the app, but recurring shipments can add up if you forget to pause.

As of 2026, Geologie commonly offers a heavily discounted intro trial set (often promoted around $3.95 shipping for a free or low-cost trial kit) plus roughly 50% off your first full box. Ongoing subscriptions ship about every 90 days at approximately $58.50 (Essential), $103.50 (Classic), and $144 (Complete) per cycle, which works out to roughly $20-$50 per month. Individual products start around $19, and a separate acne (Clear System) kit is priced separately. Students typically get about 15% off ongoing orders. This is an out-of-pocket cosmetic expense; insurance and HSA/FSA generally will not cover it, and prices and promotions change frequently. Always confirm current pricing and cancellation terms before subscribing.

Best for people 13 and older with mild-to-moderate acne, clogged pores, uneven tone, post-acne dark spots, or early fine lines who want prescription-strength results without an in-person visit (those aged 13-17 need parental or guardian consent). It also suits busy people who prefer async, app-based care. Avoid it if you are pregnant, trying to conceive, or breastfeeding, because tretinoin (and spironolactone, if prescribed) are not recommended in pregnancy. People with severe cystic or nodular acne, active rosacea flares, or complex medical skin disease are usually better served by an in-person dermatologist who can examine the skin directly and consider oral medications. Always disclose other medications, allergies, and health conditions during your consult, and treat your provider's guidance, not this article, as the final word.

Best for adults who want a simple, dermatologist-formulated daily routine for general anti-aging, dullness, mild breakouts, oiliness, or dark spots, and who will use it consistently for months. Originally marketed to men, it is now gender-neutral. Avoid or seek professional guidance if you are pregnant or breastfeeding (retinoids are generally avoided in pregnancy), have moderate-to-severe or cystic acne, rosacea, eczema, or another diagnosed skin condition, or have sensitive skin reactive to acids or surfactants like cocamidopropyl betaine. Patch-test first and consult a dermatologist before starting if you have any active skin disease or are using prescription topicals.