Apart from the really confusing names and all the layering, you also have to deal with The Ordinary product that conflict. Here’s all the conflicts on one easy chart with the information taken from the official Deciem regimen page.
The Ordinary Acids
I asked Deciem about their wording “Strong Acids”, “Direct Acids” & “Highly Acidic” and their reply was that they mean the same. Direct Acids are; Azelaic Acid, Glycolic Acid, Lactic Acid 5 & 10%, Mandelic Acid, Salicylic Acid and Alpha Lipoic. If you’re using other brands, then you must take this into consideration too. It´s best not to use 2 or more acids in the same routine to avoid irritation.
The Ordinary Peptides
When they say “Peptides”, these are Buffet, Buffet + Copper, Matrixyl and Argireline. Buffet + Copper Peptides has a few more conflicts than the others. Always read the instructions and double check with Deciem or in the Facebook Group if you’re unsure.
The Ordinary Product Conflicts
ONLY the products that have conflicts are mentioned here and obviously if you use other brands, then you need to check their ingredients too.
If you have products that conflict, use one in the morning and the other in the evening or use on alternate days.
On the official regimen page there are some conflicts that are missing from some of the products but I think I have covered these in the chart above and below. If you spot any mistakes please let me know.
| 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 |
| 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 |
| Vitamin C Suspension 30% | Niacinamide | EUK 134 |
| Ethylated Ascorbic Acid | Niacinamide | EUK 134 Buffet | Buffet + Copper Argireline |Matrixyl |
| Ascorbic Acid + Alpha Arbutin | Niacinamide + EUK 134 |
| Niacinamide | Pure Vit C, Ethylated Ascorbic Acid, L´Ascorbic Acid Powder | Vit C 23% & 30% | ELAA Ethylated Ascorbic Acid | Ascorbic Acid + Alpha Arbutin |
| Buffet | Direct Acids | Pure Vit C L ´Ascorbic Acid & Ethylated Ascorbic Acid |
| Buffet + Copper | Direct Acids | Pure Vit C L´Ascorbic Acid | Ethylated Ascorbic Acid EUK 134 | Alpha Lipoic Acid | Resveratrol + Ferulic Acid |
| Argireline | Direct Acids | Pure Vit C L ´Ascorbic Acid | Ethylated Ascorbic Acid |
| Matrixyl | Direct Acids | Pure Vit C L ´Ascorbic Acid | Ethylated Ascorbic Acid |
