Yes, you can use niacinamide and vitamin C together. The pH clash is mostly a myth.
Niacinamide and vitamin C don’t cancel each other out in a normal routine. They do different jobs: niacinamide calms oil and redness and supports your barrier, while vitamin C is an antioxidant that brightens dullness and dark spots. Using both makes sense.
The simplest way to do it: vitamin C in the morning, niacinamide at night. Below, we cover why the pH worry doesn’t hold up, how The Ordinary Niacinamide 10% + Zinc 1% and TruSkin Vitamin C fit that routine, and what to do if your skin stings.
How to use both
- Niacinamide at night Use The Ordinary Niacinamide 10% + Zinc 1% at night after cleansing. It’s the better half for oily or breakout-prone skin.
- Vitamin C in the morning Use TruSkin Vitamin C in the morning, then moisturizer and sunscreen. Its sodium ascorbyl phosphate is gentle and doesn’t need a low pH.
Start one serum at a time, a week apart.
Can niacinamide be used with vitamin C?
Yes. The old warning was that pure vitamin C (L-ascorbic acid) needs a low pH while niacinamide prefers a near-neutral one, so mixing them would cancel both out. That idea came from lab work on the raw ingredients, not from applying two finished serums to your face. Finished serums are formulated to stay stable, and using both in one routine is standard practice.
The two also do different jobs, so they complement each other. Niacinamide (vitamin B3) supports the skin barrier, helps with oil and redness, and evens tone over time. Vitamin C is an antioxidant that helps protect skin from daily environmental stress and brightens dullness and dark spots.
If the pair does bother you, the cause is usually one product on its own: a strong, low-pH vitamin C serum, or 10% niacinamide on skin that doesn't like it. That's why it's worth starting them a week apart.
Vitamin C in the morning, niacinamide at night. You get both every day and never have to think about layering order.
The niacinamide half: The Ordinary
The Ordinary Niacinamide 10% + Zinc 1% is a short, fragrance-free formula: water, 10% niacinamide, pentylene glycol, 1% zinc PCA, then thickeners (tamarind seed gum, xanthan gum) and preservatives. Niacinamide helps with oil, the look of pores and uneven tone. Zinc PCA adds extra oil control. It has a slightly gel-like feel and suits oily and breakout-prone skin best.
Ten percent is a high dose. Most skin handles it, but some people get redness or tingling. If that's you, use it every other night, or switch to a lower-strength niacinamide. Use it at night after cleansing, before moisturizer, and keep your vitamin C for the morning.
A fragrance-free water-based serum with 10% niacinamide and 1% zinc PCA. Best for oily, combination or breakout-prone skin. Use it at night, and cut back to every other night if it makes your skin flush.
One Serum or Two Separate Steps?
Is a combined serum better than two bottles?
Not better, just faster. A combined serum saves a step. Two bottles let you adjust each ingredient on its own, which helps if one of them irritates you.
When do separate bottles make more sense?
When you’re new to either ingredient or your skin is reactive. With The Ordinary Niacinamide and TruSkin Vitamin C, you can cut back on whichever one bothers you without losing the other.
Which serum goes on first?
If you use both at once, put the vitamin C on first, let it dry for a minute, then apply niacinamide. Moisturizer goes on last, then sunscreen in the morning.
Do I have to use vitamin C in the morning and niacinamide at night?
You don’t have to, but with these two bottles it’s the easiest routine. Vitamin C works well under sunscreen in the morning, and splitting them means you only layer one serum at a time.
The vitamin C half: TruSkin
TruSkin uses sodium ascorbyl phosphate, a stable vitamin C derivative, not pure L-ascorbic acid. It doesn't need a low pH to work, so the old pH argument against niacinamide barely applies here. The base is aloe juice with witch hazel water, vitamin E, glycerin and sodium hyaluronate, which makes it a gentle, hydrating serum rather than a strong, stingy one.
Use it in the morning: a few drops on clean skin, let it dry, then moisturizer and sunscreen. Skip it if your skin reacts to plant extracts. Besides geranium, the formula includes witch hazel, centella, horsetail and dandelion extracts.
A gentle, hydrating vitamin C serum built on aloe juice, with sodium ascorbyl phosphate as the vitamin C. It also has witch hazel water, vitamin E, glycerin, sodium hyaluronate and a plant polysaccharide for hydration.
Best for normal, dry or combination skin that wants an easy morning antioxidant step. It includes several botanical extracts, including geranium, so very reactive skin should patch-test first.
Should I start both serums at the same time?
No. Add one, use it for a week, then add the other. If your skin gets red or stings, you’ll know which product caused it.
What if the combination stings?
Stinging doesn’t mean the two are reacting with each other. Ten percent niacinamide makes some skin flush or tingle on its own. Drop the niacinamide to every other night, or use them at different times of day.
Does vitamin C replace sunscreen?
No. Vitamin C is an antioxidant that works alongside sunscreen. Put sunscreen on top every morning.
When should I get professional help?
If you’re treating acne, rosacea or melasma and over-the-counter serums aren’t helping after a couple of months, see a dermatologist.
Dab a little of each new serum on your jawline once a day for three or four days before using it on your whole face. Test them one at a time, not together.
The simple routine that works
Yes, you can use niacinamide and vitamin C together. The pH clash is mostly a myth, and it barely applies when your vitamin C is a derivative like the sodium ascorbyl phosphate in TruSkin.
The easiest setup with these two bottles: TruSkin Vitamin C in the morning, followed by moisturizer and sunscreen, and The Ordinary Niacinamide 10% + Zinc 1% at night. You get both ingredients every day, nothing pills, and if your skin reacts you know which bottle to blame.
If you’d rather use both in the morning, apply the vitamin C first, let it dry, then the niacinamide. Start each one on its own for a week before combining them.
