Our #1 Best Seller

Firming Vegan Collagen Prep Serum

$46

Our #1 Best Seller

Firming Vegan Collagen Prep Serum

$46

Firm. Plump. Rejuvenate.


Our 4-in-1 super serum firms, brightens, plumps, and hydrates in 4 weeks without irritation. Our skin philosophy is centered on this “prep step” - the essential, second step in your daily routine that delivers an immediate, healthy glow while conditioning skin over time. The Prep Serum “preps” skin to a balanced state after cleansing and prior to moisturizing, creating a nourished canvas that brings visible radiance. Prep Serum helps makeup glide on better while delivering calming hydration for dry skin.

This is a refillable product. 

Travel Size Full Size Refill

Free US returns

Available at

Hydrates

Cruelty Free

Suitable for sensitive skin

Fragrance Free

SUITABLE FOR SENSITIVE SKIN
VEGAN
CRUELTY FREE
DERMATOLOGIST TESTED
CLINICALLY TESTED
GLUTEN FREE
NUT ALLERGEN FREE

Delivers an Immediate, Healthy Glow

Firms, brightens, plumps, and hydrates without irritation

Our skin philosophy is centered on this “prep step” - the essential, second step in your daily routine that delivers an immediate, healthy glow while conditioning skin over time. The Prep Serum “preps” skin to a balanced state after cleansing and prior to moisturizing, creating a nourished canvas that brings visible radiance and won’t pill under makeup.

CC

Visible results in 30 days

BEFORE
AFTER 30 DAYS

Visible results in 30 days

97%

agree these products were gentle and non-irritating

92%

agree skin looks healthier

92%

 agree these products work better together

89%

agree skin appears more youthful

HEALTHY SKIN

Starts Here

CLEAN SKINCARE

ESSENTIALS

For Even The Most Sensitive

7 OUT OF 10
PEOPLE HAVE
SENSITIVE SKIN

I'm one of them

SCARLETT JOHANSSON, FOUNDER

Expertly edited

to do more with less

4.8
Rated 4.8 out of 5 stars
Based on 574 reviews
Total 5 star reviews: 503 Total 4 star reviews: 41 Total 3 star reviews: 20 Total 2 star reviews: 4 Total 1 star reviews: 6
94%would recommend this product
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574 reviews
  • CW
    Connie W.
    Verified Buyer
    How old are you? 55+
    What is your skin type? Sensitive, Combination
    June 14, 2026
    How old are you? 55+
    What is your skin type? Sensitive, Combination
    Rated 5 out of 5 stars
    Prep Serum

    Love this

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  • CB
    Carolyn B.
    Verified Buyer
    How old are you? 55+
    What is your skin type? Sensitive, Combination
    June 9, 2026
    How old are you? 55+
    What is your skin type? Sensitive, Combination
    Rated 5 out of 5 stars
    Softness for your face

    Has a very nice soft scent, smooth on and makes you skin so smooth and feels wonderful.

    Was this helpful?
  • PB
    Preeti B.
    Verified Buyer
    How old are you? 35 - 44
    What is your skin type? Sensitive
    June 7, 2026
    How old are you? 35 - 44
    What is your skin type? Sensitive
    Rated 5 out of 5 stars
    Amazing

    My skin looks so much better after using this serum, there is a reasonable difference in appearance. My acne has been in much control and less breakout. I plan getting the full set soon.

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  • VE
    Valerie E.
    Verified Buyer
    How old are you? 55+
    What is your skin type? Combination
    May 13, 2026
    How old are you? 55+
    What is your skin type? Combination
    Rated 5 out of 5 stars
    Best Primer Ever!

    Applies so smoothly and clear. Gives your foundation a beautiful glow. One of my favorite Ouset products.

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  • J
    Jacquelynn
    May 8, 2026
    Rated 5 out of 5 stars
    5 Stars

    So smooth

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