As a serum step in the evening, after cleansing and before moisturizing. It should be layered before other serums (going thinnest to thickest will work the best for most people). For those with very sensitive skin, layering over moisturizer (ex. Half + Half), is also a nice way to incorporate the product with more of a buffer.

Because sensitive skin can vary based on the individual, we recommend that those with sensitive skin do a small patch test prior to full-face application. We also recommend those with sensitive skin start by using the product 1-2 nights a week and slowly increasing to nightly use as tolerated.

Prescription-strength retinoids are considered more potent than retinaldehyde, and they should not be layered together. Retinaldehyde may be the preferred option for those who cannot tolerate prescription retinoids but are still seeking certain skin benefits. We recommend checking with your prescribing healthcare professional.

Yes. If someone is new to retinal, we recommend starting 1-2 nights a week and working up to once a day as your skin tolerates the addition. Listen to your skin. How often should I use it? People tend to get the best results when using retinoid products 5-7 nights per week. We always recommend starting slow (1-2 nights per week) and increasing frequency as tolerated.