Updated January 2023
The Ordinary Conflicts – The Ordinary products not to mix
The Ordinary Conflicts – Apart from all the confusing names and how to layer The Ordinary, you also need to understand The Ordinary and NIOD products that can and cannot be used in the same routine.
Some products conflict because they could cancel one another out, and some shouldn´t be used together as they may cause irritation (marked*). There will be a lot of conflicting advice online, but my personal advice is to follow the advice of Deciem if you are new to skincare and once you become more confident and knowledgable, you can then decide. I would also suggest that you patch-test each product before using it, or at least take it very slowly when you start layering/mixing products.
The Ordinary Conflicts – The Ordinary products you should not use together
Below this chart, you will find explanations from The Ordinary explaining why some products should not be used in the same routine.
The Ordinary/Deciem is constantly updating its conflicts chart. One of the latest changes is to avoid Peptides with Resveratrol & Ferulic Acid, only use one antioxidant in a routine, and avoid Niacinamide with Vitamin C Derivatives as well as direct/pure form.
The Ordinary Conflicts Chart
* conflicts are regularly updated so always check the official page.
The Ordinary Conflicts
On the individual product review pages within this site, you will find more information about conflicts in FAQs. If you know The Ordinary, you will know that they can often contradict themselves. You may find a few more products they suggest avoiding with certain products.
The Ordinary Response to the Vitamin C Derivatives Conflicts
Nov 2020: Deciem updated The Ordinary conflicts, and there were quite a few changes. The main difference was Niacinamide and Vitamin C Derivatives. Since The Ordinary launched back in 2016, you could use Vitamin C Derivatives with all products. There were routines with both of these products. From November 2020, Deciem said to avoid using them in the same routine. Since then, there have been a few posts on their own social media using both together again. When questioned about this, Deciem replied, “if you have used both with no irritation, you may continue to do so”.
The Ordinary Products With No/Few Conflicts
Deciem Vitamin C Derivatives should not be used with the Niacinamide Powder or the Niacinamide serum. Although, Deciem has mentioned that if you use Niacinamide Serum with Derivatives without irritation, you may continue to do so.
Oils & Hydration
- B Oil
- Marula Oil
- Moroccan Argan Oil
- Rose Hip Seed Oil
- Chia Seed Oil
- Sea-Buckthorn Fruit Oil
- Amino Acids
- Hyaluronic Acid
- Marine Hyaluronics
- Natural Moisturising Factors
The Ordinary Explains Why Certain The Ordinary Products Should Not Be Used Together
Vitamin C pure & derivatives & Niacinamide
We do not recommend combining Vitamin C (L-Ascorbic Acid, Ethylated L-Ascorbic Acid or Vitamin C Derivatives) with Niacinamide with Direct or Ethylated Vitamin C and Vitamin C Derivatives due to the formation of a salt complex that has the potential to reduce the integrity of both compounds. If you wish to combine both products into a regimen, we recommend using them on alternate days and/or nights.
Why can´t you use The Ordinary Peptides & Acids in the same routine?
Our rule against combining strong antioxidants only applies to our copper peptides products. We would not recommend combining direct acids with peptides due to the susceptibility of peptides to hydrolysis (which breaks the bonds between peptides, reducing their efficacy, and making them into individual amino acids). At low pH, the peptides undergo processes such as deamidation (the removal of an amide group) and oxidation, which compromise the activity of the peptides.
Suppose you have previously combined peptides with acids and have not experienced any negative side effects or discolouration. In that case, you may continue to combine the two products so that the combination does not pose any potential harm. Our recommendations are meant to serve as a preventative measure to avoid incompatibility between those combinations because skin tolerance is subjective.
Why can´t I mix The Ordinary Niacinamide with pure Vitamin C?
Deciem says: Our contraindication is specific to our products and their concentrations. If you’ve used them together in the past and the combination has worked for you without any issues, you may continue to do so.
You can find lots more Deciem FAQs here. Q&A found on Social media.
Other The Ordinary Conflicts & Conflicting Information
If you are an experienced skincare user, then I’m sure you have done your homework and know what’s best for your skin. For those of you who are new to skincare, it´s really down to you to decide whose advice to take. Personally, if using Deciem products, then I would take their advice, especially if you are new to skincare. Remember, they do recommend patch testing, and it´s good practice to patch test when you introduce 2 products in case of irritation.
NEW – NIOD Conflicts & Targets Chart
You can now find NIOD conflicts and targets here.