Yes. Vitamin C and an exosome serum work on different things and do not cancel each other out. Apply the vitamin C first on clean, dry skin, since most forms are formulated at a low pH and want direct contact, wait a minute, then the exosome serum, then moisturizer and sunscreen. If either stings, alternate mornings instead.
Key takeaways
- Vitamin C first on clean, dry skin, a minute's pause, then the exosome serum, moisturizer and sunscreen.
- Vitamin C is a morning product; the exosome serum fits morning, night or both.
- If the pairing stings or leaves skin pink, alternate mornings and work out which product is responsible.
Why vitamin C goes first
The most common form of vitamin C in serums, L-ascorbic acid, is formulated at a low pH so that it stays stable and can be taken up by the skin. It works best applied directly to clean skin with nothing between it and the surface. It is also usually the thinnest, most watery product in a morning routine, and thin goes under thick. Both reasons point the same way: vitamin C first.
An exosome serum is lightweight too, but it is not acidic, and it does not depend on pH to do its job. Its active is a concentration of platelet-derived exosomes, tiny vesicles that carry signaling molecules, and the goal is skin that looks smoother and more even over weeks of use. It is happy to go second. Applied over a vitamin C that has had a minute to settle, it layers without pilling and does not disturb what is underneath.
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The morning routine, step by step
- Cleanse and pat dry. Vitamin C wants dry skin; damp skin can make it sting.
- Vitamin C serum, a few drops, pressed into the face and neck. Wait about a minute.
- Exosome serum, a few drops, pressed in the same way. Wait another minute.
- Moisturizer.
- Sunscreen, generously, every day. Vitamin C and sunscreen are a standard pairing, because the sunscreen does the protecting and the vitamin C sits underneath it.
That is the whole routine. The pauses are what stop the layers from rolling up under your fingertips. If you are short on time, skip the pause between the exosome serum and moisturizer before you skip the one after the vitamin C.
Do
- Apply vitamin C to dry skin; damp skin can make it sting
- Wait about a minute before the exosome serum goes on
- Finish with moisturizer and a generous layer of sunscreen
- Keep the vitamin C capped and out of the light
Don't
- Put an oil-based vitamin C under the exosome serum; oils go last
- Add an exfoliating acid and a retinol to the same morning
- Use a vitamin C that has turned deep orange or brown
- Push through stinging; alternate mornings instead
Why morning is vitamin C's natural home
Vitamin C is most often recommended for the morning because it pairs with sunscreen and because its brightening, even-toned look is a daytime benefit. That leaves the evening free for anything that dislikes the sun or leaves skin tacky. An exosome serum can go in either slot, or both, so the simplest routine for many people is vitamin C plus exosome serum in the morning and the exosome serum alone, or with retinol, at night. The general logic of which product goes where is laid out in how to layer serums without wasting them.
If your vitamin C is a gentler derivative
Not every vitamin C is L-ascorbic acid. Derivatives such as ascorbyl glucoside, sodium ascorbyl phosphate and tetrahexyldecyl ascorbate are formulated at a friendlier pH and are less likely to sting. The layering order stays the same, vitamin C first, but the wait between layers matters less, and these forms are the better choice if the acid version has ever left your skin red. Oil-based derivatives are the exception: an oil goes last, after the exosome serum, because oil on top of water works and water on top of oil does not.
When to split them up
Some skin does not want two serums in one sitting, even compatible ones. If your face tingles for more than a minute, looks pink after application, or feels tight by mid-morning, take the two apart. Vitamin C on some mornings, exosome serum on the others, and see which one your skin was reacting to. Most of the time it is the vitamin C, because acids sting and exosome serums generally do not. Once you know which it was, bring them back together or leave them on separate mornings; neither product depends on the other to do its job.
Do not turn the morning into a chemistry set
Vitamin C and an exosome serum is a reasonable pair. Add an exfoliating acid, niacinamide and a retinol to the same session and it stops being reasonable, even if each one is fine alone. The American Academy of Dermatology's advice for choosing anti-aging products is to focus on one concern at a time and keep expectations realistic. Two well-chosen serums, moisturizer and sunscreen is already a complete morning. The INTENSE Serum, a face serum built around platelet-derived exosomes developed by Mayo Clinic physician-scientists, is designed to be that second serum, applied after the vitamin C as above.
Keep the vitamin C worth using
One practical note that affects the pairing: L-ascorbic acid breaks down with light, heat and air. A vitamin C serum that has turned from pale to deep orange or brown has lost much of what you paid for, and a degraded acid can be more irritating than a fresh one. Keep it capped, out of the bathroom window, and use it within a few months of opening. The exosome serum has no such problem, but it does not rescue a spent vitamin C either. If the pairing has started to sting when it did not before, check the color of the vitamin C bottle before you blame the combination.
When to ask a dermatologist
If a prescription product is part of your routine, ask the dermatologist who prescribed it how to sequence cosmetic serums around it. And if layering vitamin C with anything leaves your skin stinging, swollen or peeling, stop, let it settle, and see a dermatologist if it does not calm within a week.
Read next
The exosome skin serum guide explains what an exosome serum is for, how the face and body versions differ, and which to start with.
