Yes. Glycolic acid is one of the most-studied treatments for hyperpigmentation. At the right concentration (around 5%) and pH (around 3.5), it accelerates the shedding of pigmented skin cells, gradually brightening the look of dark spots, melasma, and post-inflammatory hyperpigmentation. Consistency and daily SPF matter more than concentration — a 5% formula used consistently outperforms a stronger formula used sporadically.
Most customers see visible fading of dark spots and PIH in 4–8 weeks of consistent 2–3× weekly use. Full results settle in around 12 weeks. Deeper pigmentation like melasma or older post-inflammatory hyperpigmentation can take 3–6 months. Skipping SPF resets the clock, because sun exposure regenerates the pigment the acid is fading.
No — glycolic acid itself does not darken skin. The reports of "glycolic acid darkening skin" almost always trace to one of two causes: using glycolic acid without SPF (sun exposure regenerates and deepens pigmentation), or overuse (subclinical irritation triggers post-inflammatory hyperpigmentation). Use The 5% Toner 2–3× weekly and pair with SPF 30+ in the morning to avoid both.
Yes — if overused or paired incorrectly. Glycolic acid used more than 3× weekly, or used without SPF, can trigger post-inflammatory hyperpigmentation (the exact thing it's trying to fade). Our 5% concentration is designed to be strong enough to work at 2–3× weekly use — not requiring nightly application that stresses skin.
Yes, at the right concentration and with sun protection. Brown skin has more melanin activity, which means both faster pigmentation and faster response to gentle exfoliation. A 5% concentration is the sweet spot: strong enough to work, gentle enough to avoid triggering the pigmentation-inflammation cycle that hurts brown skin more than fair skin. Always follow with SPF 30+.
Glycolic acid is one of the three best-studied ingredients for hyperpigmentation (alongside hydroquinone and azelaic acid). It's the most-recommended over-the-counter option because it doesn't require a prescription and doesn't carry the risks of long-term hydroquinone use. For post-inflammatory hyperpigmentation and mild melasma, glycolic acid at 5% is the first-line topical treatment most dermatologists recommend.
Yes, for mild-to-moderate melasma. Deeper (dermal) melasma responds slower than surface (epidermal) melasma. The 5% Toner works best in combination with strict daily SPF 30+ and gentle handling — melasma is inflammation-sensitive, so overuse can worsen it. Start at 1–2× weekly and build up.
Apply 2–3 drops to a cotton pad, sweep across cleansed face avoiding the eyes, wait 30 seconds, follow with a fragrance-free moisturiser. Use PM only, 2–3× weekly for the first month. Every morning: broad-spectrum SPF 30+. See Accordion 2 for the full protocol.
Yes, PIH is one of glycolic acid's strongest use cases. PIH from acne, minor injuries, or ingrown hairs typically responds within 4–8 weeks. Deeper PIH from insect bites or wounds may take 3+ months. Consistency with 2–3× weekly application and daily SPF makes the biggest difference.
Glycolic acid works by accelerating skin cell turnover, exposing new less-pigmented skin. Kojic acid works by inhibiting the enzyme that produces melanin. Both are effective; glycolic is typically better for post-inflammatory hyperpigmentation and rough skin texture, while kojic is often better for melasma and even-tone maintenance. They can be layered but not on the same night.
Three things matter: (1) 5% concentration — strong enough to work, gentle enough for regular use; (2) low free-acid pH around 3.5 — because acid at high pH doesn't penetrate skin effectively; (3) fragrance-free or allergen-label-free formulation — fragrance triggers the inflammation that causes new pigmentation. The 5% Toner is formulated on all three principles.