How to use PHAs in your routine, step by step
Using PHAs well is mostly about pacing. Start two to three nights per week, use it evening and let skin set the speed.
How to apply it
Typical strength is 5–15%. Use it evening.
A four-week ramp
Start two to three nights per week.
What it should feel like
Typical sensation: barely any tingle. Timeline for visible results: four to eight weeks.
Still use SPF next morning.
Troubleshooting
Stinging or flaking? Drop one session per week and add moisturizer. Do not combine with layering with strong AHAs.
If nothing happens after the full timeline, check product strength and whether you are protecting skin with SPF.
PHAs by skin type
The same ingredient behaves differently on different skin, so adapt the schedule rather than the product.
Where it sits in a routine
Here is how PHAs could slot into a simple day, given that it is best used evening.
Frequently asked questions
When should I apply PHAs?
Evening, after cleansing and before moisturizer.
How much PHAs is enough?
A thin layer — more does not speed results and raises irritation risk.
What if I miss a session?
Continue as normal; never double up.
Is it true that it is too mild to see a result?
Not quite: gentle and steady often beats aggressive and intermittent.