Alpha Hydroxy Acids aka AHA (glycolic and lactic acids) help clear away dead skin cells that have built up on the skin's surface. Glycolic acid can also penetrate throughout the layers of the skin to enable them to be exfoliated.

Method of Application
If you are new to acids, use every three days. In total, exfoliate no more than 3 to 4 times per week.

Use on clean skin (skin can be dampened with hydrosol, toner or fruit mists, or it can be dry). Apply a few drops with clean fingertips, then wait 20 minutes before using any other products. The acid will self neutralize and then you can continue with your routine.

The exception to the 20 minute wait rule is that if the acids are very uncomfortable. If so, then rinse immediately and build up a tolerance to the acids over about a months time, increasing the length of time every few days. Acids, however, are not meant to be comfortable as they are a remodeling tool.

Shelf Life and Storage Information for Our Products and Ingredients

Finished Products - generally don't need to be refrigerated as they are preserved, but you can refrigerate them to extend their shelf life. The shelf life for most products is 9-12 months. Vitamin C Serum(s) and VitaResurface products should continually be refrigerated to extend their shelf life.
Sample Sizes - do have a shorter shelf life (generally 3-6 months), and items in jars can dry up quicker than this if the lid is not tightened well enough (Vitamin C Serums - use within 90 days).

Please Keep Your Products Out of Humidity, Heat, Direct Light and in a Dark Cabinet When Possible 

Exfoliating Acid - products have a shelf life of 9-12 months. The only things we don't suggest refrigerating are the Mandelic Acid Serums or Salicylic Acid Serums, as they can crystallize in the refrigerator. If this happens, you can set the product into a hot water bath to see if the crystals will dissolve.

Additional Items That Require Refrigeration and/or Kept in the Dark

Hydrosols and Distillates - remove 1 ounce of hydrosol and add it to a separate, sterilized spray bottle and spritzer. Keep the larger bottle in the refrigerator.
Carrier and Exotic Oils - generally refrigerate all carrier oils, although some very rich oils will solidify. This is fine. All you have to do is take the oil out, warm it up at room temperature, and it should liquefy. If not, set the bottle in a hot water bath and occasionally shake the bottle, which will hopefully turn into a liquid. Some oils, like coconut cream and jojoba oil, have a super long shelf life.    

Refrigeration of The Following Ingredients is Not Necessary, But it Won't hurt

Essential Oils - essential oils are best stored in a cool, dark place.   
Co2 Extracts - these should continually be refrigerated.
Butters - we suggest refrigerating our "skincare" butters. You can remove
what you need and keep the rest in the fridge.
Clays - keep in a dry, dark place. Shelf life is at least 2 years.
Herbs All herbs <i>(whole or ground)</i> should be kept in a dark, cool, and dry location.
Herbal (liquid) Extracts are created using grain alcohol. The alcohol pulls the constituents (properties) from each herb, root, trunk, leaf, and flower. They have a shelf life of 3-5 years.
They can be stored in the refrigerator or a dark, dry place.
Other Raw Ingredients - such as Sodium PCA, Honeyquat, Oat Beta Glucan, etc., will all have different shelf lives.

Spring Water hydrating

Glycolic Acid alpha-hydroxy acid exfoliant blend

Lactic Acid alpha-hydroxy acid exfoliant blend

Gluconolactone (Glucono Delta Lactone) preservative which doesn't contain parabens or release formaldehyde into the product