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.

More than being useful solely in cosmetics settings, however, beta glucan gains practical, medical credibility from the (below) study, which supports its use to promote wound healing and reduce scarring after surgical procedures.
 

Notes from (1) of many studies
 
"The first part of the study, published in the latest issue of the International Journal of Cosmetic Science (vol. 27; issue 5; p 292), involved a single application of 5mg of 0.5 percent beta glucan per cm2 of abdominal skin. The beta-glucan contained a dye, so that its progress through the skin could be measured. The researchers found that it did, indeed penetrate the skin – a process described as being similar to the way water penetrates a brick wall. 

“It does not go through the brick, it goes through the concrete binding the bricks together," he said. "As a result of our study, we now know that glucan works through the inter-cellular lipid matrix, or the cells' cement, to enter the lower levels of the skin.” 
 
Next, a clinical study group of 27 subjects applied beta-glucan to fine lines and wrinkles on their faces over an eight-week period. Using digital image analysis of silicone replicas, they determined that there was a significant reduction of wrinkle depth and height, and that the skin was less rough. 
 
Redmond said that consumers may expect to see results in as little as ten days. His conclusion is that there is evidence to support the use of oat beta-glucan in the “care and maintenance of healthy skin and the cosmetic treatment of the signs of aging”.