iS Clinical Active Serum | Multi-Action Resurfacing & Brightening Serum

The cult product. The one iS Clinical customers never stop using once they start. Active Serum is the brand's most popular product for a reason: it produces visible results within days, not weeks, and it works on multiple concerns simultaneously in a way that almost no single serum can match.

Salicylic Acid penetrates pores to clear congestion and reduce blemishes. Natural AHAs from Bilberry resurface the skin's surface. Arbutin inhibits melanin production to fade dark spots and even tone. The result is a serum that clears, brightens and refines all at once, with a signature cooling sensation on application that tells you immediately it is doing something.

Who is Active Serum best for?

• Blemish-prone and congested skin wanting fast, visible results
• Uneven skin tone, dark spots and post-acne marks
• Rough or uneven skin texture
• Those who want results they can feel and see within days
• Anyone whose previous skincare has produced slow or minimal results
• Those on GLP-1 medications experiencing skin texture and tone changes
• Post-procedure maintenance once the skin has recovered

Key ingredients and why they matter

• Salicylic Acid 2%: A BHA that penetrates inside pores to dissolve sebum, dead skin cells and debris at the source of congestion. The only acid class that works inside the pore lining rather than on the skin's surface, making it essential for anyone whose skin congestion starts from within
• Bilberry Fruit Extract (natural Lactic Acid AHA): Gently resurfaces the skin's surface, fades post-acne marks and improves overall skin clarity and radiance with every application
• Arbutin 1%: A stable, non-irritating melanin inhibitor that targets the tyrosinase enzyme responsible for producing excess pigmentation, fading dark spots and preventing new ones forming
• White Willow Bark Extract: An additional natural source of salicylate compounds that enhances the pore-clearing and anti-inflammatory action of the formula

What results can you expect?

Noticeable improvement in skin clarity, congestion and tone within 2 to 3 days for most users. Blemishes clear faster, pores appear smaller and skin texture becomes progressively smoother and more radiant over 4 to 8 weeks of consistent use. Dark spots and post-acne marks fade progressively over 8 to 12 weeks.

How we use Active Serum at Face for Soul

As a pharmacist prescriber specialising in skin health, Active Serum is the iS Clinical product I recommend most frequently as an entry point for patients who are new to the brand. The speed at which it produces visible results is genuinely unusual. Patients who have been disappointed by slower-acting serums consistently notice a difference within days and that early result builds the compliance that makes the long-term results possible.

It works particularly well after microneedling, chemical peels and laser treatments once the skin has fully recovered, where it maintains the improved clarity and accelerated cell turnover that those procedures initiate. I also recommend it to patients on GLP-1 medications experiencing dullness and texture changes.

Build your iS Clinical routine around it

Apply Active Serum morning and evening after cleansing with the iS Clinical Cleansing Complex. Follow with iS Clinical Moisturizing Complex or Daily Dynamic Hydrator, and finish with iS Clinical Extreme Protect SPF 40 or Eclipse SPF 50+ in the morning. For those also wanting to address fine lines and firming alongside the brightening and clearing action of Active Serum, layering iS Clinical Youth Serum or Super Serum Advance+ in the evening adds anti-ageing correction to the protocol.

Frequently Asked Questions

Is the tingling sensation normal?
Yes. The cooling, tingling sensation on first application is a normal sign of the serum's active ingredients working. It typically reduces with continued use as the skin adapts.

How quickly will I see results?
Most users notice clearer, smoother and more radiant skin within 2 to 3 days of consistent use. This is one of the fastest-acting serums available at this price point.

Is it suitable for sensitive skin?
Active Serum contains 2% Salicylic Acid and AHAs which may be too active for very sensitive or reactive skin. Those with sensitive skin should start with every other evening use and build up gradually, or consider the iS Clinical Hydra-Cool Serum as a gentler starting point.

Does it increase sun sensitivity?
Yes. The AHA content may increase sun sensitivity. Always apply broad-spectrum SPF daily.

Is iS Clinical cruelty-free?
Yes. iS Clinical does not test on animals.

Is it vegan?
iS Clinical formulates without animal-derived ingredients in the majority of its products. Please contact us if you have specific ingredient concerns.

How to Use

Apply to clean skin morning and evening. A brief cooling, tingling sensation is normal. Always follow with broad-spectrum SPF during the day.