So apart from all the confusing names and layering, you also need to understand about The Ordinary products that conflicts. 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. This is VERY important to know and understand.
I have created a chart using the information given by Deciem on their regimen page. Only the products that have conflicts are mentioned here. If you use other brands, then you need to check their ingredients too.
On the official regimen
- This chart is for guidance only.
- Always read the instructions before using a product.
- Patch testing is highly recommended.
- Whilst they are not mentioned as conflicts, Deciem often say to avoid using Retinols/Retinoids, Pure Vitamin C and Direct Acids in the same routine to avoid irritation especially if you´re new to skincare or have sensitive skin. Please do your own research.
- Whilst I love you sharing this chart, please link to the page directly rather than screenshot as this page /chart is regularly updated. Thank you.
What if my Ordinary products conflict?
If you have been using conflicting products, don´t panic, just stop using them together from now on and alternate then morning and evening or use on different days.
The Ordinary Acids
I asked Deciem about their wording “Strong Acids” and “Direct Acids”. Their reply was that they mean the same. Direct Acids are; AHA 30%, Azelaic Acid, Glycolic Acid, Lactic Acid 5 & 10%, Mandelic Acid, Salicylic Acid, Salicylic Acid Masque and Alpha Lipoic.
The Ordinary Peptides
Peptides are Buffet, Buffet + Copper, Matrixyl and Argireline. Buffet + Copper Peptides has a few more conflicts than the others. Always read the instructions and
The Ordinary Vitamin C Products
When Deciem
The only vitamin c products that are
Other Conflicts & Conflicting Information
If you follow Deciem on Instagram, they will often suggest using Retinoids / Retinols, Acids and Vitamin Cs in different regimens 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 with conflicting advice, but it´s important to read and learn.
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 use 2 products in case of irritation.
The Ordinary Products & Conflicts
| Products | Conflicts |
| Retinoid 2% | other retinoid / retinol products |
| Retinoid 2% Squalane | other retinoid / retinol products |
| Retinoid 5% Squalane | other retinoid / retinol products |
| Retinol 0.2% Squalane | other retinoid / retinol products |
| Retinol 0.5% Squalane | other retinoid / retinol products |
| Retinol 1% Squalane | other retinoid / retinol products |
| Alpha Lipoic | Direct Acids EUK 134 0.1% (peptides) Buffet | Buffet + Copper Matrixyl | Argireline |
| EUK 134 | Highly Acidic Formulations of Ascorbic acid; L´Ascorbic Acid | Ethylated Ascorbic Acid Buffet + Copper Peptides |
| Resveratrol & Ferulic Acid | Buffet + Copper Peptide |
| AHA 30% | Direct Acids | EUK 134 Peptides Buffet | Buffet + Copper Matrixyl | Argireline |
| Azelaic Acid | Direct Acids | EUK 134 Peptides | Buffet | Buffet + Copper Matrixyl | Argireline |
| Glycolic Acid | Direct Acids | EUK 134 Buffet | Buffet + Copper Matrixyl |Argireline |
| Lactic Acid 5% | Direct Acids | EUK 134 Buffet | Buffet + Copper Matrixyl | Argireline |
| Lactic Acid 10% | Direct Acids | EUK 134 Buffet | Buffet + Copper Matrixyl | Argireline |
| Salicylic Acid | Direct Acids | EUK 134 Buffet | Buffet + Copper Matrixyl | Argireline |
| Salicylic Acid Masque | Direct Acids | EUK 134 Buffet | Buffet + Copper Matrixyl | Argireline |
| Mandelic Acid | Direct Acids | EUK 134 Buffet | Buffet + Copper Matrixyl | Argireline |
| L ´Ascorbic Acid Powder | Niacinamide | EUK 134 Buffet | Buffet + Copper, Matrixyl |Argireline | The Acids | |
| Vitamin C Suspension 23% | Niacinamide | EUK 134 | Buffet | Buffet + Copper | Matrixyl | Argireline |
| Vitamin C Suspension 30% | Niacinamide | EUK 134 | Buffet | Buffet + Copper | Matrixyl | Argireline |
| Ethylated Ascorbic Acid | Niacinamide | EUK 134 Buffet | Buffet + Copper Argireline |Matrixyl |
| Ascorbic Acid + Alpha Arbutin | Niacinamide + EUK 134 | Buffet | Buffet + Copper | Matrixyl | Argireline |
| Niacinamide | Pure Vit C, Ethylated Ascorbic Acid, L´Ascorbic Acid Powder | Vit C 23% & 30% | ELAA Ethylated Ascorbic Acid | Ascorbic Acid + Alpha Arbutin (there is conflicting information about using Niacinamide and Vit C, so please do your own research) |
| Buffet | Direct Acids | Pure Vit C products including L ´Ascorbic Acid & Ethylated Ascorbic Acid | Vitamin C 23% & 30% | Ascorbic Acid + Alpha Arbutin |
| Buffet + Copper | Direct Acids | Pure Vit C products including L´Ascorbic Acid | Ethylated Ascorbic Acid |Vitamin C 23% & 30% | Ascorbic Acid + Alpha Arbutin EUK 134 | Alpha Lipoic Acid | Resveratrol + Ferulic Acid |
| Argireline | Direct Acids | Pure Vit C proucts including L ´Ascorbic Acid | Vitamin C 23% & 30% | Ascorbic Acid + Alpha Arbutin | Ethylated Ascorbic Acid |
| Matrixyl | Direct Acids | Pure Vit C products including L ´Ascorbic Acid | Ethylated Ascorbic Acid | Vitamin C 23% & 30% | Ascorbic Acid + Alpha Arbutin |
