S01 The Serum bottle
A single drop
The pipette
Macro of clear serum texture on a pale grey backdrop
S01 · Serum · 30 ml

The Serum

10% Vitamin C + 5% Niacinamide + 2% Alpha arbutin + 2% Matrixyl Synthe’6
£95.00
Founding 500. Card held, nothing charged until launch day. Cancel free before then. Sixty day guarantee after delivery.
What it does

A daily brightening and firming serum formulated for skin shaved four to seven times a week. Targets the marks that linger on the jaw and neck after a shave. pH 6.5, so no sting on a fresh shave.

Actives

Sodium ascorbyl phosphate 10%. Niacinamide 5%. Alpha arbutin 2%. Matrixyl Synthe’6 2%. Hydrolysed lupine protein 1.5%. Panthenol 1%. Dual-weight hyaluronic acid. Every dose published on The Formula.

How to use

Morning, after cleansing, on dry skin. Three to four drops over the face, jaw and neck. Follow with moisturiser and SPF. Not for use in the same routine as a copper peptide product.

Texture and scent

Clear, water-light, absorbs in under a minute. Fragrance free. No colourant.

Allergen

Contains hydrolysed lupine protein, a legume. Not suitable for anyone with a lupin or peanut allergy.

Named actives. Disclosed doses.
10%
Vitamin C, stable form
5%
Niacinamide
2%
Alpha arbutin
2%
Matrixyl Synthe’6
Sirius London
Sirius London
Why pH 6.5

Close to skin’s own

Most strong vitamin C serums use L-ascorbic acid, which needs a pH near 3 to work. On skin shaved four to seven times a week that is a formula that stings and a barrier already under strain.

The Serum uses sodium ascorbyl phosphate. Stable in the bottle, effective at pH 6.5, it does not oxidise orange.

Read the full formula