Cos-IQ 20% Vitamin C Serum, 30ml | With Vitamin E & Ferulic Acid | Glowing & Brightening Skin | Anti-Aging Serum for Wrinkles, Fine Lines & Dark Spots | All Skin Types | 30-Days Pack

I'm absolutely loving this skin care product. My skin feels smoother, looks brighter, and the fine lines have reduced significantly. The formula is lightweight, non-greasy, and absorbs quickly. Highly recommend for anyone looking for a effective and gentle solution for their skin concerns.

This Cos-IQ Vitamin C 20% Serum is a potent, science-backed antioxidant formula designed for brightening and anti-aging.

Happy with the results of this serum. Protects skin from dryness. Very effective for dry skin and texture of serum is good blends well into skin and fragrance is good.

With regular use, my skin looks brighter and more even. Some old dullness has reduced, and my face feels fresher overall. it’s a good vitamin C serum for people looking to improve brightness, glow, and skin clarity without making the routine complicated.

What I like: 1. it doesn't make my oily skin any oilier 2. Airless pump packaging 3. usage of ethyl ascorbic acid which is both water n fat soluble 4. I have been using it for a month now and it works well What could be improved: 1. Plz include the % of niacinamide in the ingredient list , as some of us are allergic to it , at above 2% strength . 2. Plz include the pH of ur products on the packaging, as it wud make layering, daytime vs nighttime usage easier to determine. Update: 1. Leakage of product- The pump packaging does not work well and additional product seeps out from the sides everytime I use the pump. I have noticed the same issue with their other products, which use the same packaging. 2. Product gets oxidised, changes colour and loses efficacy about 3 months after opening it. So store it in d fridge if u want it to last longer. 3. Due to point 1 , I am reducing my rating to 3 stars now.

Used

I've been using the COSIQ Vitamin CEF-20% Face Serum for a week now, and I'm genuinely impressed. The texture is lightweight and absorbs quickly without leaving any greasy residue. Within a few days, I noticed my skin looking brighter and more radiant. The serum claims to reduce dark spots and hyperpigmentation, and I can already see a slight improvement in my uneven skin tone. My fine lines also look a bit softer, and my skin feels more elastic and hydrated. I especially love that it uses Ethylated Ascorbic Acid – it's gentle but effective. Overall, a great product if you're looking for brighter, healthier-looking skin. Definitely worth trying!

Amazing Vitamin C Serum! I’ve been using this CosIQ Vitamin CEF-20% Face Serum for a few weeks and the results are impressive! My skin feels brighter, more hydrated, and visibly smooth. It has reduced dark spots and fine lines, giving my face a healthy glow. The formula is lightweight, non-sticky, and absorbs quickly into the skin. Perfect for daily use, and the packaging is travel-friendly too. Highly recommended for anyone looking to improve skin texture and brightness.