The evidence behind our brightening serum for pregnancy

Most brightening actives were never designed with pregnancy in mind. When we formulated our serum for pigmentation during pregnancy, we built it around diglucosyl gallic acid, a clinically studied brightening active, supported by niacinamide, n-acetyl glucosamine (NAG) and mandelic acid. This article explains why we chose that combination and what the evidence says about each ingredient.

Why pregnancy pigmentation needs a different approach

Pregnancy pigmentation and melasma is common, driven by hormones and sun exposure together and the strongest brightening actives in dermatology are not safe options while you are pregnant.¹

Melasma, the patchy facial pigmentation often called the mask of pregnancy, frequently appears or deepens during pregnancy because rising hormone levels make pigment cells more reactive.¹ If you are not sure which type of pigmentation you have, our guide to hyperpigmentation vs melasma explains the difference.

Hydroquinone, the traditional prescription answer, is absorbed through the skin at rates of 35 to 45% and is not recommended during pregnancy.² Prescription retinoids are excluded too.² The full list sits in our guide to skincare ingredients to avoid during pregnancy.

That leaves a narrower shelf. Most brands stop at vitamin C or use azelaic acid, which you'd need a prescription in Australia to achieve the right dose for it to be effective. We went looking for an active with clinical evidence behind it that almost nobody else was using.

The brightening complex, ingredient by ingredient

Four ingredients do the brightening work in our serum, and each one earns its place with published evidence.

What is diglucosyl gallic acid?

Diglucosyl gallic acid is a brightening active that your skin's own surface microbes switch on, converting it into a molecule that slows pigment production.³

It begins as gallic acid, an antioxidant found in grapes and green tea, bound to glucose to keep it stable. Once applied, the microbes living on your skin convert it into trihydroxybenzoic acid, which slows the enzyme your skin uses to make pigment.³

In a double-blinded clinical study, skin treated with the active showed a measurable drop in pigment from day 14, and the effect kept building through day 84, alongside improvements in brightness and evenness of tone.³ The same research found it reduced the free radical activity and DNA damage triggered by UV light.³

Laboratory studies of gallic acid itself point the same way, showing it reduces both pigment production and the activity of the enzyme that drives it.⁴ 

How does niacinamide support a brightening serum?

Niacinamide reduces the appearance of pigmentation by stopping excess pigment reaching the skin's surface.⁵

Pigment is made in one type of skin cell, then handed across to the cells you actually see. Niacinamide interrupts that handover. In laboratory models it reduced pigment transfer by up to 68%, and in clinical trials on real skin it visibly reduced hyperpigmentation within four to eight weeks.⁵

A randomised, double-blind, placebo-controlled trial also tested niacinamide combined with n-acetyl glucosamine, the same pairing used in our serum, and found the combination reduced the appearance of pigmentation more than the placebo moisturiser.⁶

Niacinamide is one of the best studied ingredients in pregnancy skincare. We cover its full safety picture in our guide to niacinamide during pregnancy.

What do n-acetyl glucosamine and mandelic acid add?

N-acetyl glucosamine fades the appearance of dark spots, and mandelic acid gently clears the pigmented surface cells the other actives are working beneath.⁷˒⁸

N-acetyl glucosamine is a sugar-derived ingredient that works before pigment is made. In an eight-week split-face trial, a 2% concentration reduced the appearance of facial hyperpigmentation on its own.⁷ It pairs particularly well with niacinamide, which is why both sit in the same formula.⁶

Mandelic acid is the gentlest of the common exfoliating acids. Its molecules are larger than glycolic acid's, so it enters the skin slowly and causes less irritation. In clinical studies of melasma, mandelic acid combinations matched glycolic acid peels for results and were better tolerated.⁸

Those studies used strong in-clinic peels. In a leave-on serum, mandelic acid works at low levels for slow, gentle surface renewal instead.

How to use a brightening serum during pregnancy

Use a brightening serum in the evening, on cleansed skin, before your moisturiser.

Cleanse first with a gentle, low-foaming formula such as our gentle cleanser for pregnancy, apply the serum to dry skin, then seal it in with our moisturiser during pregnancy. In the morning, antioxidant support from a vitamin C serum for pregnancy complements the evening routine.

Sunscreen matters more than any serum. Pigmentation in pregnancy is driven by hormones and sunlight together, so daily SPF protects the progress your evening routine is making.¹

Expect gradual change rather than an overnight shift. In the clinical research, improvement built steadily across two to three months of consistent use.³˒⁶ You can see everything we formulate with, and why, on our full ingredient list.

This article is general information, not medical advice. Always check with your doctor, midwife or pharmacist about your individual circumstances.