Ingredient comparison
Cysteamine vs GHK-Cu: which one is right for your skin?
Short answer: Both earn their place. GHK-Cu is the kinder pick if your skin reacts easily, otherwise it comes down to preference. And if you are pregnant, GHK-Cu is the safer one to reach for.
| Compared | Cysteamine | GHK-Cu |
|---|---|---|
| Potency | Higher | Lower |
| Evidence | strong evidence | moderate evidence |
| Irritation risk | Moderate | Low |
| Clogs pores | Low | Low |
| In pregnancy | Not in pregnancy | Considered safe |
| On a label | usually effective at 5% | usually effective at 0.01-0.1% |
So which should you pick?
Choose Cysteamine if
- dark spots, dullness or an uneven tone are what you want to work on
- you want the pick with the most research behind it
Choose GHK-Cu if
- fine lines and firmness are your main goal
- your skin is sensitive or reacts easily
- you are pregnant or breastfeeding, since only GHK-Cu is considered safe
The honest bottom line: Both earn their place. GHK-Cu is the kinder pick if your skin reacts easily, otherwise it comes down to preference. And if you are pregnant, GHK-Cu is the safer one to reach for.
Pregnancy: Only GHK-Cu is considered safe to use in pregnancy.
Better for your concern
- Dark spots and uneven toneCysteamine
- Fine lines and firmnessGHK-Cu
- Sensitive, reactive skinGHK-Cu
Based on their scores in the knowledge base. "Either" means both hold their own for that goal.
No known clash between these two. If you want both, you can layer them; introduce one at a time.
Check these two in the tool →Or decode a whole product label →Cysteamine vs GHK-Cu, answered
Which is stronger, Cysteamine or GHK-Cu?
Cysteamine is the more potent of the two, with the higher efficacy score. GHK-Cu is the lighter option.
Is Cysteamine or GHK-Cu better for sensitive skin?
GHK-Cu is the gentler choice for sensitive, reactive skin (low irritation risk, versus moderate for Cysteamine).
Can you use Cysteamine and GHK-Cu together?
There is no known clash between them. You can layer them if you like, just introduce one at a time.
General guidance, not medical advice. Read the full pages on Cysteamine and GHK-Cu.