Review topics: [skin, serum, feels, smell, absorbs, vitamin c, glow, looks, texture, results, difference, buy, oil, formula, use, irritation, c-tetra, size, works, face, consistency, improvement, vit c, bottle, effect, spots, complexion, reaction, medik8, lines].
Reviews
Broken Bottle - the top squeeze part came away from the lid
"I loved the product - however I was only able to use it for approx a week due to the bottle breaking and the entire bottle emptying out into my make up bag - so I feel I wasn't able to get a proper testing of the product. However what I did love was the feel of it - it applied to my skin so smoothly and smelt amazing!"
— Kelly F. (5/5)
My only vitamin C serum
"I am using this for over 4 years and don’t want to use any other brands I had used before. This serum works amazingly with dark spot, moisture, truly glows my skin and makes my skin smooth. Sometimes, I only use this serum and sunscreen only without moisturizer. It is no greasy and lasts long with a few drops each day."
— An C. (5/5)
Pleasant to use and it
"Pleasant to use and it helps even out skin tone well. However, the oil is extremely runny and pours from the dropper like water, making it difficult to control the amount. Honestly, it feels as though the dropper was designed this way so that the product gets used up faster and needs to be repurchased more often."
— Elena K. (5/5)
The best vitamin C ever
"This has to be my holy grail vitamin C. Although it is oil based, it isn’t oily. It sinks right in, leaves my skin feeling feather soft and provides an immediate glow. I’ve been using this for about 6 weeks now and people have commented on how nice my skin looks."
— Ross G. (5/5)
love it, my 10th bottle maybe
"C-Tetra™ is a lovely vitamin C serum that gives my skin a healthy glow and feels gentle enough for daily use. It absorbs quickly, layers well with other products, and leaves my skin looking brighter and more even over time."
— Maryna G. (5/5)
Travel vitamin C
"I am loving this c. tetra as it absorbs well, no oily sheen. It’s definitely helping my skin feel smoother and calmer, but it is only the 7% so I find it perfect for my sensitive blemish prone skin. I had previously used the 15% strength which was too oily for me and couldn’t apply make up properly afterwards. The travel size gives plenty of days to trial. I do apply a small amount of daily moisturiser over the top. Allow 10 minutes, if you can, before make up."
— Jenny H. (5/5)
Good product
"A good start in your vit c journey, i used 2 bottles of it. It has a good texture and your skin absorbs it well without feeling tacky. Hoever, I have now become obsessed with the 20% serum with exossomes."
— Patricia M. (4/5)
Me encanta
"Llevo usándolo ya unas semanas y me gusta mucho. El olor es muy agradable y deja la piel muy suave. Veo que tengo la piel más luminosa y junto con los otros productos que estoy utilizando, veo que se ve menos las pequeñas arrugas y mi piel parece más sana."
— Katie W. (5/5)
A great vitamin C serum for brighter, healthier-looking skin.
"I’ve been using Medik8 C-Tetra and really love how lightweight and comfortable it feels on the skin. It absorbs quickly, gives a healthy radiant glow, and makes my complexion look fresher and more even over time. My skin feels smoother, hydrated, and more energized in the mornings. It’s gentle enough for daily use and layers well with other skincare products."
— Iryna Y. (5/5)
Amazing vitamin C!
"C-Tetra has become one of my favorite vitamin C serums because it brightens my skin without irritation. The formula feels nourishing and gives such a radiant glow, especially in the morning under sunscreen and makeup. My complexion looks more even, healthier, and more refreshed since adding it into my routine. It’s perfect if you want the benefits of vitamin C without the harshness some stronger formulas can cause. Medik8’s vitamin C line is also often praised for being gentle yet effective for glow and antioxidant protection.  Together, these two products make my skin look smoother, brighter, hydrated, and overall more youthful. Expensive? Yes. But for me, absolutely worth it."
— HA N. (5/5)
