How do I use C15 Super Booster?

Apply a few drops to clean skin or mix into your moisturizer. Follow with sunscreen in the morning, since vitamin C works alongside sun protection.

Is it good for sensitive skin?

It is formulated for all skin types, but vitamin C can tingle. Patch test on your inner arm first and start every other day.

How long until I see results on dark spots?

Most users report visible brightening after four to eight weeks of daily use. Dark spots fade slowly, so consistency matters more than amount.

Can I use it with retinol?

Yes, but many people alternate them, vitamin C in the morning and retinol at night, to limit irritation.

Is $28 at eBay a good price?

It is the lowest of the 7 stores listing it new as of November 5, 2026. Check the seller's authenticity and expiry before buying.

Yes, Paula's Choice lists the formula as cruelty-free.

Where is the Paula's Choice C15 Super Booster cheapest?

At eBay, for $28.00, 38% under what the other stores charge, as of our latest check.

Where can I buy the Paula's Choice C15 Super Booster?

7 stores we checked sell it, including eBay, Poshmark, ModeSens, mercari.com, Kohl's.

Paula's Choice C15 Super Booster

Best price now

$28.00at eBayObserved at 12:45 PM

38% under what the other stores charge

Compared across 7 stores. Prices are checked against each store and labelled with when.

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Our take on the Paula's Choice C15 Super Booster

Paula's Choice C15 Super Booster is a concentrated vitamin C serum meant to be mixed into a moisturizer or used on its own. It pairs 15% vitamin C with vitamin E to target dullness, dark spots and fine lines. The best new price is $28.00 at eBay as of November 5, 2026, the low end of what the 7 stores listing it new charge.