VITAMIN C SERUMS
The Right Vitamin C Serum for Your Skin
Five serums built on our scientifically advanced L-Ascorbic Acid, from a gentle 7.5% eye formula to the 20% GeneXC Serum. This page exists to help you pick the right one, not just any one.
PURE CHEMISTRY
Which vitamin C serum should you choose?
Vitamin C is one ingredient with many jobs: antioxidant protection, a brighter and more even tone, and support against the visible signs of ageing. The choice is rarely whether to use it, but which formula. iS Clinical builds every face serum here on L-Ascorbic Acid, the well-studied form of vitamin C, then changes what surrounds it. Super Serum Advance+ pairs a 15% concentration with Copper Tripeptide-1. Pro-Heal Serum Advance+ adds olive leaf extract with vitamins E and A for compromised, blemish-prone skin. GeneXC Serum raises the concentration to 20% alongside our Extremozymes. C Eye Serum Advance+ calibrates it down to 7.5% for the eye area. Match the concentration and the pairing to your skin and the decision makes itself.
Five vitamin C serums, five different jobs
Same core science, different supporting casts. Read the reasons, not just the ratings.
Best for Your first serious vitamin C
The balanced all-rounder: a 15% concentration of L-Ascorbic Acid with bioidentical Copper Tripeptide-1, plus botanical antioxidants and safe skin brighteners. Choose it if you want one serum covering tone, texture and fine lines.
Best for Blemish-prone or compromised skin
The same advanced vitamin C, but paired with olive leaf extract and pure vitamins E and A. Pick this over Super Serum when your skin is compromised or blemish-prone and needs its antioxidant support tilted towards calm.
Best for Maximum strength and radiance
The strongest of the five: 20% of our exclusive vitamin C with Extremozymes and fruit acids from land and sea. Choose it when uneven tone and glow are the priority and your skin already tolerates actives well.
Best for The eye area
Vitamin C calibrated to 7.5% for delicate skin around the eyes, with Copper Tripeptide-1 against fine lines, puffiness and dark circles. Choose it alongside a face serum, not instead of one.
Best for Targeted brightening boosts
The outlier on this page: not a vitamin C formula but a concentrated botanical brightener with controlled exfoliation and no peeling. Choose it for stubborn uneven patches, or layer it with a vitamin C serum.
CONCENTRATION, DECODED
Match the strength to your skin
More is not automatically better. A 7.5% concentration respects the thin skin around the eyes. Fifteen per cent is the proven day-in, day-out territory where most skin lives happily. Twenty per cent asks more of your skin and gives more back in radiance and tone. If you are new to vitamin C, start at 15%, use it consistently, and step up to GeneXC only when your skin asks for it. Whichever you choose, morning application pairs naturally with your daily SPF.
Vitamin C, chosen well: FAQs
Which iS Clinical vitamin C serum is the strongest?
GeneXC Serum, with 20% of our exclusive L-Ascorbic Acid combined with Extremozymes and botanically sourced fruit acids. It is the pick for experienced vitamin C users focused on tone and radiance.
What is the difference between Super Serum Advance+ and Pro-Heal Serum Advance+?
Both are built on our scientifically advanced L-Ascorbic Acid. Super Serum adds Copper Tripeptide-1 and safe skin brighteners for tone and fine lines; Pro-Heal adds olive leaf extract with vitamins E and A, angled towards compromised, blemish-prone and ageing skin.
Can I use a vitamin C serum around my eyes?
Use one designed for it. C Eye Serum Advance+ carries vitamin C at 7.5%, a concentration chosen for the delicate eye area, and targets dark circles, puffiness and fine lines.
When in my routine should vitamin C go?
After cleansing, before moisturiser. Most people prefer the morning, where its antioxidant protection complements a daily SPF; consistent daily use matters more than the hour.
Is 20% vitamin C too strong for sensitive skin?
Sensitive skin usually does better starting at 15% with Super Serum or Pro-Heal, then stepping up if wanted. Patch test first and introduce any new active gradually.
Will these serums help with dark spots?
They are formulated to visibly even skin tone: Super Serum includes safe skin brighteners, GeneXC targets tone and radiance, and Brightening Serum adds targeted botanical brightening with controlled exfoliation for stubborn areas.
Choose your strength, then build around it
One vitamin C serum, chosen deliberately, will outperform three chosen at random.