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Ultra-C Serum

16 reviews
$98.00 $98.00
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Ultra-C Serum
16 reviews

[ uneven skin tone ]
sun and moon
New, Improved Formula!
*We've changed the ratio of the two vitamin C extracts and find that it brightens the skin even better. You'll notice that the viscosity is slightly different and the color of the product is quite a bit lighter. Please let us know what you think. We look forward to hearing your feedback about the new formula.

Two kinds of stabilized 15% vitamin C combined with our powerful Herbalbright Complex‚ĄĘ delivers advanced protection against environmental stressors. Added ferulic acid and vitamin E team up to help rejuvenate dry, damaged skin and minimize the appearance of fine lines and wrinkles. The vitamin C extracts that we use are non-sun sensitizing, so you can use this product morning or night.


  • Helps protect skin against environmental stressors
  • Helps improve the appearance of uneven skin tone
  • Helps improve the appearance of fine lines and wrinkles

DIRECTIONS: Shake well. Massage 2-3 drops into face, neck, chest, backs of hands--anywhere that shows sun damage. Will not cause sun sensitivity. Use once daily, in the morning or evening as your first leave-on product. Follow with your favorite moisturizer.


vitamin C  6% Tetrahexyldecyl Ascorbate is a stable, oil soluble Vitamin C ester that helps clarify and brighten skin tone by inhibiting melanogenesis (production of pigment).

vitamin c  11% M.A.P. Magnesium Ascorbyl Phosphate is a stable, water soluble derivative of Vitamin C that helps lightens dark spots by inhibiting tyrosinase activity. It’s gentler than L-asorbic acid on sensitive skin.

herbalbright complex¬† Herbalbright Complex‚ĄĘ¬†is our proprietary blend of botanicals. Packed with powerful antioxidants, these plants work synergistically to help improve the appearance of sun damaged skin. Natural resveratrol (present in Japanese Knotweed), licorice and lemon peel bioferment help brighten and even skin tone.

Ferulic Acid is a soothing antioxidant that can also help improve the stability and effectiveness of other antioxidants, such as vitamins C and E. It helps rejuvenate dry, stressed skin and improve the appearance of an uneven skin tone.

Kojic Acid is a gentle exfoliator. It can help brighten skin and improve uneven skin tone. The story goes that it was originally discovered when someone noticed that the hands of Japanese saki makers were beautifully bright and smooth, even though the rest of their skin was old and weathered. Kojic acid can be derived from koji, which is created during the sake brewing process from fermented rice. Ours is obtained from mushrooms.

Bearberry (Uva ursi) Fruit also known as kinnikinnick, is packed with powerful antioxidants. The leaves have a high concentration of hydroquinone, primarily in the form of arbutin (Arbutin is a distant relative of hydroquinone, but is totally natural and more gentle on the skin), thus giving bearberry extract its ability to brighten the skin. It can help rejuvenate skin and lessen the signs of aging. This sweet little plant carpets the forests in our Central Oregon mountains year-round. 

Lemon Peel Bioferment is a prebiotic, supporting healthy skin, brightening darker spots and patches and helping improve the appearance of dull, lack skin. Whole lemon fruits are macerated and incubated with Lactobacillus lacti (the same bacteria used to produce many fermented food products like cheese and sour cream). This ferment is then further processed to remove the potential allergens, citral and geraniol. The resulting ferment is said to have high antioxidant activity.

FULL INGREDIENTS LIST: Aloe vera gel*, goji berry extract*, magnesium ascorbyl phosphate 10% (vitamin C), tetrahexyldecyl ascorbate 5% (vitamin C), elderberry fruit extract*, Herbalbright¬†Complex‚ĄĘ (extracts of mallow*, peppermint*, cowslip*, lady‚Äôs mantle*, speedwell*, lemon balm*, yarrow*, helichrysum* and bearberry fruit (uva ursi)*), rosehip seed oil*, evening primrose oil*, kojic acid, vitamin E oil (wheat-free mixed tocopherols), ferulic acid (rice extract), lactobacillus/lemon peel bioferment, ylang ylang essential oil, xanthan gum, essential oils of Roman chamomile*, bergamot, Oregon lavender* and Immortelle (Helichrysum italicum)*.

*Certified Organic ~Wild Harvested

NOTE: Color variations are normal in our small-batch products. The bottle you receive may be a bit lighter or darker than pictured.

Handcrafted in Bend, Oregon 1 fl oz | 30ml

Customer Reviews
4.9 Based on 16 Reviews
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Molly B.
United States
I recommend this product

My long-standing favorite.

The C-Serum is my constant and has been for years. I switch out the other serums to provide variety but always have C-Serum to apply once a day. It is also the perfect gift for my mom and sister as they use it the same way I do.

United States United States
I recommend this product

Liquid Gold

This was the first product I ever used from AOS and I feel in love! I purchase this for all my friends to get hooked on AOS. You see great results quickly! AOS is amazing with samples which shows me my second favorite product is willow bark serum. With this combo you will have a clear skin!

Ellie G.
United States United States
I recommend this product

My new favorite: Ultra-C Serum

The serum feels luxurious on my skin and offered a very mild exfoliation and noticeably brighter skin. Love it.

Margaret P.
United States United States
I recommend this product

My favorite summer serum

I’ve used this serum every summer for three years and love it! I use it to help control sun exposure spots and it does help. It also smells clean and fresh every morning and night, and works through the fall/winter until I run out. Please keep making this :)

*Certified Organic ~Wild Harvested

Handcrafted in Bend, Oregon

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