TL;DR
Skin biology runs on a 24-hour circadian clock — a defend phase during the day and a repair phase at night. These are not interchangeable. TEWL peaks in daylight hours; cell division, collagen synthesis, and ingredient absorption peak overnight. 9HAᵈ eXO³ is a dual-serum system built around this split — one serum for each phase, doing different jobs at the right time. Here's the science behind why timing matters as much as formulation.
Your skin runs on a 24-hour clock. Most routines don’t.
Most people use the same serum morning and night. That's not wrong. But it's also not getting the most out of what the skin is capable of — because the skin at 8am and the skin at 2am are doing completely different things.
The skin operates on a circadian rhythm: a roughly 24-hour biological clock that governs when cells divide, when barrier repair happens, when permeability peaks, and when the skin is most exposed to environmental stress. Most routines treat the skin as a static surface. The biology says otherwise.
Timing changes what your skincare can actually do
During daylight hours, the skin is in defend mode. Trans-epidermal water loss is elevated. Sebum production peaks in the early afternoon. The skin is actively managing UV exposure, environmental particulates, and moisture loss in real time. The biological priority is holding the line — not rebuilding it.
"The same ingredient applied at different times of day reaches a different skin. Not because the formula changed — because the biology did."
At night, the priority inverts entirely. Cell division typically peaks during early sleep hours. Growth hormone peaks during deep sleep and supports collagen synthesis. Skin permeability increases — which means ingredients penetrate more effectively at night due to increased skin permeability, compared to daytime application. The skin isn't just resting. It's running its own repair programme, and it's doing it whether or not your routine supports it.
This is why timing of application matters as much as formulation. An ingredient applied at the right phase of the clock works with a biological environment already primed to receive it. The same ingredient applied at the wrong phase is working against the current.
Two phases. Two serums. One system.
9HAᵈ — built for the daytime defend phase
9HAᵈ is the morning serum. 1% 9-Carbon Hyaluronic Acid (a multi-depth formulation) penetrates multiple epidermal layers to maintain hydration during the hours when TEWL is highest. 7-Dehydrocholesterol — a Vitamin D3 precursor — supports barrier function and skin health during the defend phase. Vitamin B Complex manages the inflammatory load that accumulates through daily exposure.
The formulation logic follows the biology: support what the skin is already trying to do during daylight hours, rather than introducing repair signals into a defend-phase environment.
eXO³ — built for the overnight repair phase
eXO³ is the evening serum, formulated for the repair phase. Three plant-derived Exosome Nanovesicles — Portulaca, Tomato, Panax Ginseng — are designed to support multiple repair pathways: cell proliferation, pro-collagen synthesis, free radical neutralisation, melanin reduction, and inflammatory modulation.
Applied when permeability is highest and the body's own repair mechanisms are most active, eXO³ is working with the clock rather than against it. The skin at night is a different receptor environment than the skin during the day. The serum is designed for this phase.
Together — a full 24-hour recovery cycle
Used in sequence — 9HAᵈ in the morning, eXO³ at night — the two serums cover the full biological cycle without overlap or gap. This is not two products doing the same thing in smaller doses. It's two products doing different things at the right time.
Day defends. Night repairs. The routine should reflect the biology.
A routine built around the clock, not just the calendar
The standard skincare logic is product-first: find the right ingredients, apply consistently, expect results. That logic isn't wrong. But it's incomplete when it treats timing as irrelevant.
A routine calibrated to the circadian rhythm compounds differently. The defend-phase serum is working when the skin is most exposed. The repair-phase serum is working when the skin is most receptive. Neither is duplicating the other's job.
9HAᵈ eXO³ is available for skin in clinical recovery — post-procedure, when the repair cycle is running harder than usual — and as standalone daily support for any skin that needs more than standard skincare delivers. The timing principle applies in both contexts. The clock doesn't change because the skin is in recovery. If anything, it matters more.
How to use the system
Morning: 9HAᵈ — apply 2–3 drops after cleansing, before moisturiser. Follow with SPF.
Evening: eXO³ — apply 2–3 drops after cleansing, before moisturiser. No SPF needed.
Consistent twice-daily use is what allows the system to support the full 24-hour cycle. Morning-only or evening-only use leaves one phase of the biology unsupported.
FAQ
Why does timing matter for skincare?
Skin biology changes significantly between day and night. TEWL is higher during the day, making hydration support more critical. At night, skin permeability increases and cell division peaks — meaning repair-focused ingredients work more effectively than during daylight hours. A routine that accounts for this works with the skin's own clock rather than ignoring it.
What is 9-Carbon Hyaluronic Acid?
9-Carbon HA is a multi-depth hyaluronic acid formulation designed to penetrate multiple epidermal layers, supporting hydration across the full depth of the epidermis rather than sitting at the surface.
What are Exosome Nanovesicles?
eXO³ uses plant-derived exosome nanovesicles — microscopic vesicles derived from Portulaca, Tomato, and Panax Ginseng — as a delivery system designed to support multiple repair pathways. The term "exosome-inspired" reflects that the technology mimics natural exosome function using plant-derived sources.
Is 9HAᵈ eXO³ suitable for post-procedure skin?
Yes. The system is used in clinical recovery contexts, where the repair cycle is running at higher intensity after procedures. The circadian principle is the same — defend during the day, repair at night — but the repair-phase support from eXO³ is particularly relevant when the skin is in active recovery.
Can I use both serums if I don't have a specific skin concern?
Yes. The system is designed for daily support, not only post-procedure use. Any skin that benefits from consistent hydration, barrier support, and overnight repair can use 9HAᵈ eXO³ as a long-term routine.
Where can I get it?
Available at all Aglow Clinic locations and at draglow.com.
This article is for educational purposes and does not constitute medical advice. Results from skincare products vary depending on individual skin conditions and consistency of use. For personalised advice, consult a qualified medical professional.