Ingredient comparison
4-n-Butylresorcinol vs Magnesium Ascorbyl Phosphate: which one is right for your skin?
Same comparison whichever way you searched it: Magnesium Ascorbyl Phosphate vs 4-n-Butylresorcinol.
Short answer: Both earn their place. Magnesium Ascorbyl Phosphate is the kinder pick if your skin reacts easily, otherwise it comes down to preference. And if you are pregnant, Magnesium Ascorbyl Phosphate is the safer one to reach for.
| Compared | 4-n-Butylresorcinol | Magnesium Ascorbyl Phosphate |
|---|---|---|
| Potency | Similar | Similar |
| Evidence | moderate evidence | moderate evidence |
| Time to see it work | 4–8 weeks | Never measured |
| Irritation risk | Moderate | Low |
| Clogs pores | Low | Low |
| In pregnancy | Ask your doctor | Considered safe |
| pH-dependent | No | Needs the right pH |
| On a label | usually effective at 0.1-1% | usually effective at 3-10% |
So which should you pick?
Choose 4-n-Butylresorcinol if
- you would rather it just work, without depending on the product being at the right pH
Choose Magnesium Ascorbyl Phosphate if
- your skin is sensitive or reacts easily
- you are pregnant and want the clearly safe choice, since 4-n-Butylresorcinol is one to clear with your doctor first
The honest bottom line: Both earn their place. Magnesium Ascorbyl Phosphate is the kinder pick if your skin reacts easily, otherwise it comes down to preference. And if you are pregnant, Magnesium Ascorbyl Phosphate is the safer one to reach for.
Pregnancy: Magnesium Ascorbyl Phosphate is considered pregnancy-safe, while 4-n-Butylresorcinol is one to clear with your doctor first.
Better for your concern
- Dark spots and uneven toneEither
- Fine lines and firmnessMagnesium Ascorbyl Phosphate
- Sensitive, reactive skinMagnesium Ascorbyl Phosphate
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 →From our dataNeither has to be the answer: 58 other ingredients in our glossary share a family with these two.
4-n-Butylresorcinol vs Magnesium Ascorbyl Phosphate, answered
Which is stronger, 4-n-Butylresorcinol or Magnesium Ascorbyl Phosphate?
They are close in strength: 4-n-Butylresorcinol and Magnesium Ascorbyl Phosphate score similarly on efficacy. Choose by skin type rather than power.
Is 4-n-Butylresorcinol or Magnesium Ascorbyl Phosphate better for sensitive skin?
Magnesium Ascorbyl Phosphate is the gentler choice for sensitive, reactive skin (low irritation risk, versus moderate for 4-n-Butylresorcinol).
Can you use 4-n-Butylresorcinol and Magnesium Ascorbyl Phosphate 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 4-n-Butylresorcinol and Magnesium Ascorbyl Phosphate.