With twice daily use of 2-3 drops per application, a bottle will last approximately 3-4 months. For maximum efficacy, we recommend the product be used within 6 months after opening.
It is important to note that due to the high level of pure and potent L-Ascorbic Acid USP in the formula, it is normal for the formula to yellow over time due to air and light exposure. This natural color change does not substantially affect the product's efficacy. Should your serum turn an orange/deep amber, it is best to replace the product. To maximize product shelf life, store your serum at room temperature and ensure the dropper cap is tightly sealed after each use.

Yes, Serum 10 is suitable to use within the same daily skincare routine as retinol.

Historically, Vitamin C (which is acidic) and retinol (which performs best at a higher pH) were thought to require separation. However, with well-formulated products like Vivier’s, this is not always necessary - our Vitamin C serums and Retinol can be layered consecutively.

If you’re looking to optimize your retinol results or improve tolerability, you may choose one of the following approaches:
1. Wait at least 30 minutes after applying Serum 10 before applying your Retinol
2. Use Serum 10 in the morning and Retinol in the evening
3. Use Serum 10 and Retinol on alternating evenings

Please consult your skincare provider with any questions.

Serum 10 can be used both morning and night. For optimal results, apply twice daily as part of your skincare routine..
Although some prefer applying serums directly from the dropper, to prevent potential contamination, we recommend dispensing 2 to 3 drops of Serum 10 into your palm and using fingertips to apply a thin layer to face, neck, chest, and back of hands as desired. A general rule to follow when layering products is to apply them from thinnest to thickest texture.

L-Ascorbic Acid USP (pure Vitamin C), the primary ingredient in Vivier’s Vitamin C serums, may gradually develop a light-yellow hue over time. This natural color change does not substantially affect the product's efficacy. Thanks to our propriety IDS delivery system which shields naturally unstable Vitamin C molecules from oxidation, our serums are known to maintain their clarity and efficacy longer than other Vitamin C serums on the market.
To further maximize the shelf life of your Serum 10 we recommend tightening the dropper securely after each use, storing your serum at room temperature, and using it within 6 months of opening to ensure optimal results. Should your serum turn an orange/deep amber, it is best to replace the product.

Many of our customers see and feel an improvement in their skin in as little as one use, however, individual outcomes may vary. Given the natural skin cycle is approximately 28 days long, when used consistently and as directed, customers tend to see significant, noticeable results in as little as 4 weeks. We recommend taking before and after pictures to assist in tracking progress.

Yes, Serum 10 is suitable to use as soon as one day post non-ablative procedures. Always consult with a physician or provider for individualized post-procedure care.

Yes, Serum 10 is ideal for all skin types, including sensitive as it doesn't contain other active ingredients making it milder for sensitive skin.
Every skin is unique so while most people with sensitive skin will have no issue using Serum 10, some might. Please consult your skincare provider with any questions.