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I spent three months layering every hydrating serum I could find. Some mornings my skin looked plump and dewy. Other mornings it looked exactly the same as when I woke up. That inconsistency drove me a little crazy.
The two ingredients that kept coming up in every “best hydrating serum” list were hyaluronic acid and polyglutamic acid. Both promise deep hydration. Both sound clinical. And both show up in a lot of the same products now.
So I dug into the research to figure out what actually separates them. Turns out, the differences matter more than I expected. One holds five times more water than the other. But that doesn’t automatically make it better for your skin.
Here’s a full breakdown of polyglutamic acid vs hyaluronic acid, including which one works better for different skin types and whether you should use both.
Best PGA Serum
The INKEY List
Polyglutamic Acid Serum
This is the PGA serum I always recommend to people just getting into polyglutamic acid. It’s a clean, simple formula with a gel texture that layers well under moisturizer. You can feel the moisture-locking film right away without any stickiness. It plays nicely with HA serums and works in both morning and night routines.
Best HA Serum
L’Oreal Paris
Revitalift 1.5% Pure Hyaluronic Acid Serum
If you want a drugstore HA serum that actually delivers, this is it. L’Oreal uses 1.5% pure hyaluronic acid in a lightweight, fragrance-free formula. It absorbs fast and leaves skin feeling bouncy without any residue. I’ve gone through multiple bottles and it consistently performs as well as serums twice the price.
Best HA Moisturizer
Neutrogena
Hydro Boost Water Gel
Not a serum, but worth mentioning because it’s one of the best HA moisturizers out there. The water gel texture is incredibly light and works for every skin type, including oily. It’s a good option if you want HA benefits without adding a separate serum step. Layer PGA underneath this for the ultimate hydration sandwich.
READ: best hyaluronic acid serums
evrygal recommends: The INKEY List Polyglutamic Acid Serum for polyglutamic acid vs hyaluronic acid, based on our hands-on testing.
Both polyglutamic acid and hyaluronic acid deserve a spot in your routine. Start with HA as your everyday base. Add PGA when you want that extra moisture lock. Your skin will tell you pretty quickly which combo it likes best.
evrygal recommends trying the two-step approach. Apply hyaluronic acid to damp skin, then seal it with polyglutamic acid. It takes about 30 extra seconds and the difference in how your skin feels by the end of the day is noticeable.
Key Takeaways
- Polyglutamic acid holds 5,000x its weight in water compared to hyaluronic acid’s 1,000x
- PGA works best as a surface-level moisture lock while HA penetrates deeper layers
- You can use polyglutamic acid and hyaluronic acid together for maximum hydration
- Apply HA first, then layer PGA on top to seal in moisture
- The INKEY List Polyglutamic Acid Serum is the best affordable PGA serum to start with
Last updated: April 07, 2026
FAQ
Is polyglutamic acid better than hyaluronic acid?
PGA holds more water (5,000x vs 1,000x), but HA penetrates deeper into the skin. They work differently, so one isn’t strictly better. For surface hydration and barrier protection, PGA wins. For deep, multi-layer hydration with decades of research, HA wins.
Can I use polyglutamic acid every day?
Yes. PGA is gentle and non-irritating. You can use it morning and night. Apply it after your HA serum and before your moisturizer for the best results.
Does polyglutamic acid replace hyaluronic acid?
Not really. They work at different skin depths. PGA sits on the surface and locks moisture in. HA absorbs into deeper layers. Using both gives you more complete hydration than either one alone.
What goes first, polyglutamic acid or hyaluronic acid?
Apply hyaluronic acid first on damp skin. Let it absorb for about a minute. Then apply polyglutamic acid on top to seal in the moisture. Thinner textures always go before thicker ones.
Can polyglutamic acid cause breakouts?
PGA is non-comedogenic and rarely causes breakouts. Its film-forming action doesn’t clog pores. If you’re acne-prone, check the other ingredients in the formula. PGA itself is safe for all skin types.
