Timeless Vitamin C Serum Review — COUI Skincare

Timeless Vitamin C Serum Review

The Timeless Vitamin C Serum is a 30 ml bottle of goodness. For skin with issues such as sun damage, acne scars and aging signs, this is a godsend. The Timeless Vitamin C serum has some of the ingredients which you can’t find in any other serums.

The timeless skin care products are unique in their own way and this particular serum is no different. The serum has high concentrations of hyaluronic acid and matrixyl. This is an au natural and paraben free product which makes it a great option for sensitive skin.

The Timeless Hyaluronic Acid Vitamin C serum helps in building collagen and evens out the skin tone. The added ingredients, Vitamin E and Ferulic acid, help to extend the shelf life of this serum with 20% Vitamin C. You can use it for up to 3 months due to this feature.

Timeless Vitamin C Serum Review

Let’s start with the common things such as the ingredients list, directions etc. and we will gradually take it from there. The review will come out in each of the following headings.


The photo aging defense serum has Water, L-Ascorbic Acid, Ethoxydiglycol, Alpha Tocopherol, Polysorbate 80, Propylene Glycol, Panthenol, Sodium Hyaluronate, Ferulic Acid, Benzylalcohol, Dehydroacetic Acid and Fragrance. As you can see from CosDNA, the ingredients list is relatively safe, only discounting the possible flare of acne and irritation because of Vitamin E.

vitamin e ingredients avocado

If you have had any negative experience with products containing Vitamin E, be sure to do a patch test before you start using it. Also, doing a patch test is recommended for trying out any product for the first time, especially for those with sensitive skin.

How to Use

First, clean your face as you normally would. Remove all makeup. Apply a few drops of serum onto the fingers and massage. Wait for a few minutes to let the product absorb completely onto the skin. Follow up with a moisturizer or the rest of your skincare. Apply 1-2 times daily, depending on how your skin responds to it.


  • Don’t use if you have oily skin as it contains Vitamin E.
  • Be cautious with the amount of product you put on as it will cause exfoliation.
  • Always wear a sunscreen if you are using in the morning and going out.
  • Don’t use during the same time as using Retinols, Glycolic acids or Beta acids. Wait a few hours in between if you need to use products with these ingredients in the same day.

Caution for Newbies

caution newbie girl

If this is your first time using a Vitamin C product, you need to be extra cautious. Your skin needs to get used to it gradually, so don’t dump it with too much of it. Also, keep in mind that the Vitamin C is in 20% concentration, which has to be taken seriously.

  • Start by using only once every 2 days.
  • As already mentioned, don’t mix it with other acids. Also, don’t mix it with products containing AHA or BHA either. This will cause burning in your skin.
  • If the stinging is too bad, wash it off immediately with water. Use fewer drops if necessary.
  • MUST wear sunblock during the daytime, as your skin will be getting photo sensitive.
  • Stop using if irritation or itchiness occurs at any time during using this serum.


Don’t expect to get an overnight result from the Timeless Vitamin C Serum as that is not possible. You need to keep using it on a regular basis to see actual results. The serum will eventually get well used to your skin. The timeless beauty products generally suit well to my skin and this was no difference.

At first when you put it on, you will feel a slight tingling, and it is completely normal. Wait for a few minutes and let it absorb. After a while the tingling goes away. If the tingling gets to the point you can’t handle it, wash off your face with clean water and stop using it.

I like using mine during the night time, as in right before getting on my bed as it assures me that I won’t be getting any sun damage. If you must use it during the daytime, make sure to use a sunscreen. A sunscreen is a must for every single day anyway, whether or not you use a Vitamin C serum with Ferulic acid.

I am using this product to deal with my acne scars and hyperpigmentation. I also have sun damage which has made my forehead darker than the rest of my face. Now if I use this product and then go out in the sun without the protection of a sunscreen, it will do more bad than good.

I have seen visible results after using it for over 1.5 months. The scars have lightened and my overall complexion has brightened up a bit. One thing I have noticed is that the serum works better on newer scars compared to the older ones.

The serum promises another thing which is its anti-aging properties. Now I’m in my twenties so I can’t really vouch for it, but from the way it has changed my skin for the better, I assume it works well for that aspect as well.

girl with smooth skin

One thing that I would like to add is that the Ferulic acid serum benefits the skin because I have experienced plumpness on my skin. Overall, it feels a lot healthier and glowing looking than before I started using it.

If you are looking to see better results, you can follow up with a Vitamin C cream as your moisturizer. A moisturizer will soothe the dryness from the serum while simultaneously adding more benefit to your skin.


Always keep it in the refrigerator as Vitamin C starts breaking when on direct connection with sunlight. If you want to extend the usage period to 3 months, always make sure that you follow this step. Once you start using it, you will notice a slight yellowing. This is completely normal.

But you need to stop using it once it turns a dark yellow. The dark yellow tone means it has gone bad and there is no point in continuing using it. Replace with a new one.

Comparison with the COUI Super C Serum

The Super C Serum from COUI skincare is another Vitamin C serum I like. It has similarities with the Timeless Vitamin C serum as both contain the star ingredient, Vitamin C, in 20% concentration. But of course, there are some differences as well.

One of the main differences is the ingredients list. The COUI Super C Serum has more ingredients than the Timeless one, as you can see from CosDNA. If we compare the ingredients list, you can see that the COUI Super C one is at an advantage, as there are no red flags for this one. Also, the added collagen is great for those looking to hinder the signs of anti-aging.

The Phenoxyethanol in the COUI Super C Serum has a 4 in the safety list, whereas the Benzyl Alcohol has a 5. The higher the number on the safety list, the worse it is. Of course, both contain alcohol, which is necessary for the preservation, but bad for the skin.

If you have dry skin, chances are, the alcohol in the serums will make you dry out even more. A moisturizer hence is another must for you. But, if you want to compare, the COUI Super C Serum wins in my book because of the lesser number.

The COUI Super C Serum doesn’t contain any Vitamin E, so this is a better option for people with oily skin. As there are no chances of acne flare ups or irritations, people with oily skin with issues to be tackled with vitamin C can use the COUI one with ease.

Final Words

Overall, I like the Timeless Vitamin C Serum as it has helped out my skin condition. I will recommend it to people with sensitive skin. However, for oily skin, I will instead recommend the COUI Super C Serum.

The ingredients list is comparatively safer for the COUI Super C Serum, so I think it is a safe product for most skin type otherwise. If you are just starting out, try the COUI Super C Serum one first as your skin is more likely to react positively to this one over the Timeless Vitamin C Serum.

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