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Quick Verdict
Best for: people who want a high-strength 15% vitamin C concentration from a trusted formulator. Skip it if: you’re new to vitamin C — this concentration can be too strong for first-timers.
What Is This Product?
C15 Super Booster is Paula’s Choice’s high-concentration vitamin C serum, formulated at 15% L-ascorbic acid — near the upper range of what’s considered effective without causing excessive irritation. It’s positioned as a “booster” you can use on its own or add into your existing moisturizer.
Key Ingredients
- 15% Vitamin C (L-ascorbic acid) — near the top of the effective concentration range
- Vitamin E and Ferulic Acid — stabilize the vitamin C and boost antioxidant effect
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Who This Is Probably a Good Fit For
Best for people who already have some vitamin C experience and want to step up to a higher concentration for more noticeable brightening. Not the best starting point if you’ve never used vitamin C before — ease in with a lower concentration first.
Pros and Cons
What We Like
- High, effective concentration backed by research on L-ascorbic acid
- Ferulic acid and vitamin E improve stability and effectiveness
- Trusted, research-driven formulator
Worth Knowing
- Higher concentration means higher irritation potential for sensitive skin
- Pricier than entry-level vitamin C options
Frequently Asked Questions
Is 15% vitamin C too strong for beginners?
It can be. If you’ve never used vitamin C before, starting with a 5-10% formula and working up reduces the risk of irritation and stinging that higher concentrations can cause.
Can you mix it into your moisturizer?
Yes — it’s specifically designed as a “booster” that can be mixed into your regular moisturizer or used as a standalone serum, giving some flexibility in how you incorporate it.
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