BECAUSE EVERY PRODUCT CAN BE BESPOKE

THE MOISTURIZER

Blend and Boost is the Goldilocks of moisturizers. There are five options for a cream base and a boatload of so-called boosters: a blackcurrant–balloon vine blend is said to nourish sensitive skin, for example, while peptides reduce redness. $200. Blendandboost.com.

THE CLAY MASK

At Subtle Green, users choose a base—activated charcoal–Brazilian clay for cleansing, seaweed– French clay for hydrating, and so on—then add vitamin or antioxidant infusions. Finally, they pick from scents like rose, jasmine or honeysuckle. $93. Subtlegreen.com.

THE SERUM

Province apothecary customers answer a glut of questions about their problem areas, sun exposure, even menstrual cycles, then leave with a face serum made from essential oils like rosehip, sea buckthorn and pomegranate. $146. 1518 Dundas St. W., 647-479-4854.

THE HAIR CURE

The Function of Beauty team includes two MIT engineers who deal in bespoke hair cures. A customer with fine, curly hair seeking anti-frizz and shine, for example, might get products infused with acai oil, coconut and tamarind extract. $49. Functionofbeauty.com.

THE PERFUME

The cultish brand Le Labo, beloved by Gwyneth Paltrow and Justin Bieber, will create a custom perfume on-site, blending scents like Santal 33 (musk, iris, cardamom, violet) and Thé Noir 29 (bergamot, fig, bay leaf and cedar). $205. 876 Queen St. W., 416-531-3129.