Vitamin C is the most recommended ingredient for uneven tone, and the most commonly misused. Used well, it helps fade the look of dark spots and makes your sunscreen more effective. Used badly — too strong, too often, on an already-irritated face — it does the one thing you cannot afford in melanin-rich skin: it irritates, and irritation makes pigment.
What it actually does
Vitamin C is an antioxidant. Through the day, UV and pollution generate free radicals that push pigment-producing cells into overdrive; vitamin C mops those up. It also interferes with one of the steps in pigment formation, which is why it helps the look of existing marks fade rather than only preventing new ones. And it supports collagen, which is a pleasant side effect nobody complains about.
The percentage question
Higher is not better. Above roughly 10–15% the added benefit flattens out while the irritation risk keeps climbing. For melanin-rich skin, a 5–10% formula used every single day beats a 20% formula used twice a week and abandoned — the ingredient works cumulatively, so consistency is worth more than concentration.
If you have never used it, start at the lower end, every other morning for two weeks, then daily.
When to use it
Morning, on clean skin, before moisturiser and sunscreen. It is a daytime ingredient because its main job is defending against what the day throws at you. Give it a minute to absorb, then moisturise, then SPF.
And yes, you can use it alongside niacinamide — the old "never mix them" advice comes from studies of unstable formulations decades ago. Modern versions pair well; most people simply put vitamin C in the morning and niacinamide at night because it is the simplest way to keep the routine light.
The tingle test
A very brief tingle on application can be normal. Stinging, burning, redness that lasts, or skin that feels tight and raw is not — that is the irritation you are trying to avoid, and continuing through it will make marks darker, not lighter. Drop to every other day, apply to fully dry skin, or buffer it by applying moisturiser first.
Storage matters more than people think
Vitamin C oxidises in light, heat and air. A serum that has turned deep orange or brown has lost potency — it is not dangerous, it is simply no longer doing much. Keep it capped, out of the bathroom window, and use it within a few months of opening. Opaque or dark bottles exist for a reason.
A working morning routine
- Gentle cleanse
- Vitamin C, on dry skin
- Moisturiser
- SPF 30+, broad spectrum — see why SPF is a dark-spot product
That is it. Four steps, every morning, for at least 6–8 weeks before judging — the normal fading timeline is slower than most people expect.
Our 5% Vitamin C Face Serum is formulated at the daily-use end of that range for exactly this reason, and it is the vitamin C step inside the Brightening Set for Melanin-Rich Skin.