The Ordinary Products Conflicts Guide

The Ordinary Conflicts – so apart from all the confusing names and how to layer The Ordinary, you also need to understand about The Ordinary products that conflict. Some conflict and some shouldn´t be used together as they may cause irritation. I highly recommend you read through this page and the official Deciem Regimen Page so you understand which products can and can´t be used together.

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The Ordinary Conflicts

  • Below is a chart using the information given by Deciem on their regimen page. Only the products that have conflicts are mentioned in the first chart. If you use other brands, then obviously you need to check their ingredients too.
  • This page is regularly updated so please link to it rather than screenshot. This chart is only a guide. Always read the instructions on the official Deciem website.

Please see this latest page – The Ordinary products you can and cannot mix

The Ordinary Conflicts
The chart will take you through to a simpler page The Ordinary products you can and cannot mix
  • Always read the instructions before using a product.
  • Whilst they are not mentioned as conflicts, Deciem advises to avoid Retinols/Retinoids, Pure Vitamin C and Direct Acids in the same routine to avoid irritation. Copper Peptides should not be used in the same routine as Retinol/Retinoids.
  • This is just a guide and this page takes no responsibility for any problems caused by using products incorrectly, not reading the instructions first, and not patch testing.

The Ordinary Conflicts Chart – all products with and without conflicts

Chart will take you through to a simpler page for The Ordinary conflicts.

The Ordinary Conflicts

The Ordinary Products With No/Few Conflicts

Vitamin C Products – Derivatives

*Please note that according to the latest information from Deciem, the Vitamin C derivatives should not be mixed or used with The Ordinary Niacinamide Powder. Some products that have no conflicts should not be mixed with Niacinamide powder although they may be used afterwards. Please read the instructions of each product.

More Molecules

Oils & Hydration

Deciem Explains Why Certain The Ordinary Products Should Not Be Used Together

Why can you not use The Ordinary Peptides & Acids in the same routine?

Our rule against combining strong antioxidants only applies to our products containing copper peptides. 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.

Having said that, if you have previously combined peptides with acids and have not experienced any negative side effects or discoloration, you may continue to combine the two products as so as the combination does not pose any potential harm. Our recommendations are meant to serve as a preventative measure to avoid any incompatibility between those combinations and also because skin tolerance in 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.

Other The Ordinary Conflicts & Conflicting Information

If you follow Deciem on Instagram, they suggest using Retinoids / Retinols, Acids, and pure Vitamin Cs in different routines due to irritation. There’s also conflicting information about Niacinamide and Vitamin C. The more you read on the internet the more confusing it will be.

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 I’m using Deciem products then I will take their advice. Remember, they do recommend patch testing and it´s good practice to patch test when you introduce 2 products in case of irritation.

The Ordinary Skincare Routines