01
Cell turnover
Accelerates the exfoliation of old keratinocytes, the cells that dull the surface when they stay on too long.
Vitamin A · Night
Serum A.
Nightly renewal without irritation. A retinol engine unlike most others, stabilized by Vitamin E.
$175$5.83 / ml30 ml · Night application
"Maximized Skincare. Transderma A and C."Teresa Grundin · Elle.se, 2014
The work Renewal while you sleep.
Serum A is a precision-engineered retinol formulation that works deeply in the basal layers of the skin to accelerate exfoliation and stimulate the formation of collagen and elastin. As dead cells shed, fine lines, surface texture, and scars visibly soften. The skin renews itself; the serum provides the trigger.
The active form is retinyl palmitate, which converts to retinol once inside the skin: a gentler, more controlled delivery than direct retinol in an irritating base. It is stabilized by Vitamin E (Alpha-Tocopherol Acetate), which protects the active from oxidation and keeps the formula stable bottle to drop.
"The body functions during the day and recovers, regenerates, and heals during the night. Serum A is built around that rhythm."
Serum A is a night formula. Pair it with Serum C by day; the two work on the same structural proteins from opposite directions.
Ingredients Four ingredients. All functional.
The formula is built on squalane (a lipid that skin recognizes) as a delivery base, with an isosorbide co-solvent, Vitamin E as a stabilizer, and retinyl palmitate as the active. Anhydrous, with no preservatives, fragrance, or fillers. Every molecule has a role, and the bottle stays potent for two years from the first drop to the last.
01
Squalane Delivery lipid
A skin-identical lipid that carries the actives through the barrier without disrupting it. Non-comedogenic, anti-inflammatory, and a natural part of human sebum.
02
Dimethyl Isosorbide Co-solvent
A gentle solvent derived from sugar. Dissolves the retinyl palmitate into the lipid base and enhances its penetration without added water.
03
Alpha-Tocopherol Acetate Vitamin E · Stabilizer
Prevents the oxidation of retinyl palmitate. Also functions as an antioxidant in its own right, supporting the skin's own defense against free-radical damage.
04
Retinyl Palmitate The active · Vitamin A
A gentler ester of Vitamin A that converts to retinol once inside the skin. Drives cell turnover, softens wrinkles, and supports collagen synthesis. The single most-studied topical anti-aging active.
How to use At night, on bare skin.
Apply Serum A nightly to clean, dry skin. Unlike most retinols, Serum A is non-irritating: a gentler converted form, stabilized by Vitamin E. Use every night from the start, with no need to build up.
01
Clean, dry skin
Cleanse and dry face and neck before bed. One to two drops across bare skin; avoid the immediate eye area.
02
Allow to absorb
One to five minutes for the serum to sink in fully.
03
Finish with moisture
Finish with Transderma Moisture Serum (M) if your skin needs it. Let it absorb completely.
04
Continue routine
Once completely absorbed, you can continue with your usual routine: sunscreen, makeup, anything you normally use.
Every night, from day one. Unlike most retinols, Serum A doesn't require a slow build-up. The gentler converted form and Vitamin E partner make nightly use comfortable from the first application.
What it does
Four jobs,
overnight.
Retinol is one of the most extensively studied topical actives in dermatology. Serum A delivers it with a gentler converted form and a stabilizing partner, so the benefits accumulate without the irritation typical of harsher retinol products.
02
Wrinkle softening
Stimulates collagen and elastin production, reducing the depth and visibility of fine lines and expression wrinkles.
03
Texture & tone
Evens out rough patches, pigmentation, and post-acne marks as the skin cycles through faster.
04
Skin integrity
Maintains the structural quality of the skin over time: the kind of change that shows up after weeks, not hours.
Pairs with
The system
around Serum A.
Serum A is complete as a night routine. Paired with C, M, or O, it becomes the night half of a full day/night system built around cellular turnover and regeneration.
Day · Brightening
Serum C
The day counterpart. Vitamin C stimulates collagen; A drives turnover. C by day, A by night: a complete anti-aging pair.
$175→
Day & Night · Barrier
Serum M
Layer after Serum A absorbs to soothe any transitional dryness from increased turnover. Ceramides rebuild the barrier.
$175→
Day · Cellular energy
Serum O
Feeds the mitochondria that power turnover and collagen synthesis. Amplifies what A starts at night.
$175→
Shipping
Free standard shipping on orders over $150. Delivered worldwide from Stockholm. Full shipping details.
Returns
14 days from invoice date. Products in original packaging, refunded to the original payment method. Returns policy.
Approved & registered
Laboratory approved by Läkemedelsverket. Registered under EU Cosmetics Legislation. Never tested on animals.