Citric Acid is also used as a preservative (up to 1/2 %), foam-stabilizer, and to adjust the Ph (acid/alkali balance) of your products. Also used as a mild alpha-hydroxy acid to lighten and brighten the skin. It is derived from fermenting crude sugars. No known toxicity.
A Citric Acid solution (50%) can be made by weighing an equal amount of Distilled Water and Citric Acid Raw Material. Gently add the Citric Acid into the water and stir well to mix. This solution can be stored in the desired container and used as needed; ensure the mixture is at room temperature before using. Add the solution drop by drop, mixing and closely monitoring the pH change until it reaches the desired level.
NOTE If sensitive skin, limit the rate to 0.25% strength.
INCI: Citric Acid Purity: 100% Physical Form: White Powder Melting Point: N/A Applications: Topical Usage Rate: Up to Formulator's Discretion Solubility: Water
Shelf Life and Storage Information for 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 (except for our 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 - remove 1 ounce of hydrosol and add it into a separate, sterilized spray bottle and spritzer. Keep the larger bottle in the refrigerator. Carrier Oils - generally, you can refrigerate all carrier oils, although some very rich oils will solidify. This is fine. All you have to do is take it 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. ^There are some oils with a super long shelf life, like Coconut Cream and Jojoba Oil. Refrigeration is not necessary, but it surely 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 (whole or ground) should be kept in a dark, cool and dry location. Herbal (liquid) Extracts - these are created using alcohol. The alcohol pulls the constituents from each herb—root, trunk, leaves, and flowers. Extracts have a shelf life of 3-5 years. They can be kept in the refrigerator (or a dark DRY place) Other Raw Ingredients - i.e., Sodium PCA, Honeyquat, Oat Beta Glucan, etc. will all have a different shelf life.
