The Ordinary Products You Can & Cannot Mix Guide

The Ordinary You Can & Cannot Mix

If you´re new to this brand, all the names of products can be really confusing and it’s so hard knowing which of The Ordinary products you can and cannot mix together. The regimen page on the Deciem website is great, but there are quite a few conflicts missing and products which you should take care when using together.

This is only to be used as a guide. Instructions of products must be read before using and patch testing is highly recommended. This page is updated so please link to this page rather than screenshot. Thank you.

The Ordinary Conflicts

Hylamide Conflicts

  • Sub Q Skin: Treat the same as The Ordinary Buffet
  • Hylamide Pore Control: Use as you would The Ordinary Niacinamide.
  • Hylamide C25: Use as The Ordinary pure vitamin c.

NIOD Conflicts

This is just a guide. Please always double check with Deciem.

  • NIOD ELAN Ethylated Ascorbic Acid Network: As per The Ordinary Pure Vitamin C Conflicts.
  • NIOD CAIS: Treat the same as Buffet + Copper Peptides.
  • NIOD CAIL: Treat the same as Buffet + Copper Peptides.

The Ordinary Products You Can & Cannot Mix

Below you can find explanations from Prudvi Kaka. Chief Scientific Officer at Deciem explaining why certain products shouldn´t be used together. Please remember that there will be conflicting advice. This is the advice from Deciem using Deciem products.

ask Deciem for a regimen

Deciem Responses Regarding Conflicts & The Ordinary Products You Can & Cannot Mix

Why can´t I use Vitamin C, Retinoids & Direct Acids in the same routine?

Deciem says: If you wish to incorporate multiple Vitamin C’s, Retinoids, and/or Direct Acids into your skincare regimen, we suggest using them on alternate evenings and waiting until your skin has adjusted to one before introducing another.

Why can I not use The Ordinary Acids together?

By Prudvi at Deciem. We do not recommend combining this masque with other direct acids in the same regimen due to the subjectivity of skin tolerance. With salicylic acid being present in the formula at high concentration, combining it with other acidic and high strength formula may increase the sensitivity of the skin. If you decide to combine this masque with other direct acids, we recommend you perform a patch test of the combination prior to full facial application.

Why can´t I use The Ordinary Buffet with Acids & Vitamin C?

By Prudvi on Reddit. We would not recommend combining direct acids or Vitamin C with peptides because (at a low pH) the peptides undergo processes such as deamination and oxidation, which compromise the activity of the peptides.  Our recommendations are meant to serve as a preventative measure to avoid any incompatibility between those combinations (due to various concentrations and formats offered within our range) and also because skin tolerance is subjective. If you have been combining them and this has been working for you, you may continue to do so as the combination will not harm the skin.

Why can´t I mix Direct Acids & Peptides?

Prudvi from Deciem says: 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 deamination (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 is subjective.

Copper Peptides & Antioxidants, Direct Acids & Peptides

By Prudvi: 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.

By Prudvi: 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 is subjective. Hope this helps!

Why can you not mix The Ordinary Niacinamide & Pure Vitamin C?

By Prudvi on Reddit 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.

The Ordinary Products You Can & Cannot Mix

Conflicting Information

The more you read on the internet, the more conflicting information you will find and the more confusing it will become.  If you´re new to skincare, I would advise you to follow the advice given by Deciem about The Ordinary products you can & cannot mix until you become more familiar with the products, ingredients, and skincare in general.

Patch Testing

As with any products from any brand, allergic reactions can happen.  Deciem advises patch testing products before using on your face. You should also patch test when you first start to layer products.  The truth is many people don´t patch test. I personally feel that it´s extremely unfair to blame the products and the company if you do just slap it all on your face without testing and then get a terrible reaction. Read how to patch test and remember to read about all The Ordinary products you can & cannot mix on this page or on The Ordinary Regimen Page.

How Do I Create A Skincare Regimen With All These Conflicts?

After reading about all these conflicts and what you can and cannot use together, I hope it´s all a little clearer. You can get a really good idea of combinations by looking at The Ordinary Routines here and don´t forget, you can also ask Deciem for a personalised regimen.