ilso CG Toning Serum 30ml: Centella + Glutathione Brightening Serum for Post-Acne Marks

ilso is a Korean indie brand with a more minimalist aesthetic and active-focused positioning. The CG Toning Serum pairs Centella Asiatica (the "cica" ingredient) with glutathione, a master antioxidant and tyrosinase-adjacent brightener. The CG in the name stands for these two ingredients. At $31.20 for 30ml, pricing is in the mid-premium indie range, reflecting the glutathione content.

Glutathione has become a popular brightening ingredient in K-beauty over the past few years, particularly for post-inflammatory hyperpigmentation (PIH) and uneven tone. Topical glutathione has less clinical backing than oral glutathione for systemic brightening, but research suggests it works for surface-level tone evenness at appropriate concentrations. Centella calms irritation that often accompanies the redness/discoloration cycle.

What It Does

Glutathione inhibits tyrosinase (the enzyme that produces melanin) and provides antioxidant defense against free radicals that drive hyperpigmentation. Centella Asiatica extract (madecassoside, asiaticoside) reduces inflammation and supports barrier repair. The combination addresses post-acne marks on two fronts: preventing new pigment and calming the inflammation that creates new marks. Results build over 8 to 12 weeks of consistent use.

Who It's For

• Post-acne dark marks: Primary target, addresses both pigment and inflammation.
• Uneven skin tone: Gentle brightening over time.
• Sensitive brightening seekers: Less irritating than vitamin C.
• Combo to oily skin: Lightweight texture.
• K-beauty active users: Complements vitamin C and retinol routines.

Key Specs

• Volume: 30ml
• Price: $31.20
• Hero ingredients: glutathione, Centella Asiatica extract
• Texture: light watery serum
• Fragrance: minimal
• Packaging: dropper bottle

How to Use

After toner, dispense 3 to 5 drops into palms. Press and pat over face. Let absorb 1 minute before next step. Use AM and PM. For targeted dark marks, apply an extra drop to specific areas. Pair with vitamin C AM and retinol PM (glutathione layers well with both) for a comprehensive brightening stack. Always use SPF when using brightening actives.

FAQ

Does topical glutathione really work?

For surface-level PIH and tone evenness: moderately, over 8 to 12 weeks. Topical glutathione is less well-established than oral or IV glutathione for systemic brightening, but research supports its effect on hyperpigmentation at the skin level. It's gentler than vitamin C with a different brightening pathway.

ilso CG Serum vs a vitamin C serum?

Different mechanisms. Vitamin C inhibits tyrosinase directly and is a stronger single-ingredient brightener. Glutathione offers antioxidant support plus tyrosinase effect but at lower potency. Use together for stacking, or alternate for sensitive skin.

How long until I see results?

Post-acne marks: 8 to 12 weeks for visible lightening. Overall tone: 6 to 8 weeks. Stubborn old marks may take 4 to 6 months. Don't judge before 2 months of consistent use.

Can I use it with retinol?

Yes. Apply glutathione serum first, let absorb, then retinol over top. Or alternate nights if your skin is sensitive. No direct ingredient conflicts.

Is it okay for sensitive skin?

Generally yes. Centella calms the formulation, making it gentler than most brightening serums. A small percentage of users may react to glutathione; test on a small area first if highly sensitive.

Related Products

Pair with a vitamin C serum for stacked brightening, or layer under a Korean moisturizer. Always finish AM with Korean sunscreen.

Shop ilso or Korean brightening products.