Why is vitamin C in the morning and retinol at night the gold standard anti-aging pairing?

Vitamin C applied in the morning provides antioxidant protection against UV-induced free radical damage and brightens existing discoloration. Retinol applied at night drives cell turnover, stimulates collagen, and refines texture. Separating them by time of day avoids any pH conflict, and the two mechanisms are complementary — antioxidant protection during the day, cellular renewal overnight. Neither active duplicates what the other does.

Is this bundle right for someone who has never used vitamin C or retinol before?

Yes, with one adjustment. Brightening Boost at 10% L-Ascorbic Acid is suitable from day one. Time Rewind Retinol (0.25%) is the gentlest effective concentration, but new retinol users should start at 2-3 nights per week for the first 2-3 weeks before building to nightly. The bundle includes both, so start with vitamin C daily and introduce retinol gradually.

Do I need to use sunscreen with this bundle?

Yes, every morning without exception. Time Rewind Retinol increases cell turnover, leaving fresh skin cells at the surface that are more sensitive to UV damage. Broad-spectrum SPF 30+ the morning after any retinol application protects those new cells and prevents photodamage from undoing results. Vitamin C adds antioxidant protection but does not replace sunscreen.

Can I use both products if I am pregnant or nursing?

Partially. Brightening Boost Vitamin C at 10% L-Ascorbic Acid is safe during pregnancy and nursing. Time Rewind Retinol is not recommended during pregnancy or breastfeeding due to vitamin A absorption concerns. If you are pregnant or nursing, use the Brightening Boost AM serum only and pause retinol until after. Consult your OB/GYN.

How much does the bundle save compared to buying separately?

The Power Bundle is $206, saving $50 versus buying Brightening Boost ($128) and Time Rewind ($128) separately at $256. The Pro Bundle is $296, saving $140 versus the two Pro systems at $436. Both tiers offer meaningful savings for establishing the clinically proven vitamin C and retinol routine.

Can I switch to individual refills after the bundle runs out?

Yes. Once the bundle is depleted, purchase refills of Brightening Boost and Time Rewind individually — Power refills at $68 each, Pro refills at $108 each. You keep the dispensers from the bundle and simply replace the active powder, maintaining your proven AM/PM routine at a lower per-cycle cost.

What results does the combination deliver, and how quickly?

Vitamin C targets dark spots and uneven skin tone — most users notice brightening within 4–8 weeks of consistent morning use. Retinol addresses fine lines and skin texture — Exponent's brand-commissioned 4-week clinical study showed 100% of subjects had measurable improvement, with 76% showing increased elasticity at the 0.25% concentration.

Can I add niacinamide or other actives alongside this bundle?

Yes. Niacinamide is compatible with both vitamin C and retinol and can be used AM or PM. If adding other actives, introduce one at a time and monitor skin tolerance. Avoid layering other exfoliating acids (AHAs, BHAs) with retinol on the same night, as this increases irritation risk. Let vitamin C and retinol be the core of your routine before expanding.

Epic Age Defiers: Vitamin C and Retinol Power Serums

Name: Epic Age Defiers Power Serums
Brand: Exponent Beauty
SKU: PST-BUNDLE-24-EPIC
Price: 206.0 USD
Availability: InStock
Rating: 4.6 (143 reviews)

Targets:

sunspots pigmentation fine lines wrinkles

Epic Age Defiers Power Serums

Regular price: $206.00 | 83 mL
Sale price: $206.00
Regular price: $256.00

Clinically proven anti-aging results that are nothing short of epic.

Ultra-brightening 10% L-Ascorbic Acid Vitamin C (for the AM) and age-defying 0.25% Retinol (for the PM) are activated fresh with a multi-weight Hyaluronic Acid for a potent, hyper-moisturizing serum with visible, clinical results in 1-2 weeks.

Recommended for

FINE LINES + WRINKLES

DARK SPOTS + SUN DAMAGE

What's included

How to use

Full Ingredients

FREE OF

“Within a week my sunspots lightened… my skin is clearer and brighter. I won’t use anything else—and trust me, I’ve tried everything.”

“I sent a friend the Vitamin C saying it’s the only one I’ve ever seen real impact from… even compared to SkinCeuticals. Now our whole chat group subscribed.”

“I was afraid to try because most products irritate my skin… but this dramatically transformed my skin. My barrier heals faster and the glow is unreal.”

Rachel B.

Verified Buyer
Kristin K.

Verified Buyer
Tenku I.

Verified Buyer

Follow us @exponent.beauty and see what people are saying

100% MEASURED WITH INSTRUMENTATION

Clinical Results

Percentage trumps perception: we are committed to doing full, measured clinical tests on all of our products.

FINE LINES + WRINKLES

100% of subjects

had a decrease in fine lines and wrinkles in 1 week

FIRMNESS

DISCOLORATION & PIGMENTATION

Featured In

FULL OF

Age-defying 0.25% Retinol—equivalent to prescription-strength—in every dose, preserved in its most potent powder state until activated by our Hyaluronic Acid Hydrator. Formulated for sensitive skin.

Learn More

Epic Age Defiers Power Serums

Clinically proven anti-aging results that are nothing short of epic....

$206.00 - Add to cart

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sunspots pigmentation fine lines wrinkles

Epic Age Defiers Power Serums

What's included

How to use

Full Ingredients

FREE OF

“Within a week my sunspots lightened… my skin is clearer and brighter. I won’t use anything else—and trust me, I’ve tried everything.”

“I sent a friend the Vitamin C saying it’s the only one I’ve ever seen real impact from… even compared to SkinCeuticals. Now our whole chat group subscribed.”

“I was afraid to try because most products irritate my skin… but this dramatically transformed my skin. My barrier heals faster and the glow is unreal.”

Follow us @exponent.beauty and see what people are saying

100% MEASURED WITH INSTRUMENTATION

Clinical Results

FINE LINES + WRINKLES

100% of subjects

FIRMNESS

72% of subjects

DISCOLORATION & PIGMENTATION

66% of subjects

Featured In

FULL OF

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