Ingredient Solubility and Product Shelf Life

Here is information regarding the solubility of the ingredients you listed and clarification on product shelf life.

Ingredient Solubility

Based on the product information:

• Centella Asiatica Extract (Madecassoside 90%): This is water soluble or dispersible.
• Soy Extract (Isoflavones / Genistein): The water-soluble form (Isoflaqua™) is soluble in water. Tryptic-Soy™ is also water dispersible/soluble.
• Willow Bark Extract (Natural Salicylic Acid): This is water soluble.
• Phytosterols (Plant Sterols): This ingredient is oil soluble and should be mixed in the oil phase.
• Pure-TECA™ Centella Asiatica Extract (TECA 95%, CICA): This is not soluble in water or oil but can be dissolved in glycols like Propylene Glycol or Butylene Glycol with heat, or dispersed in the formula.

If your cream feels oily, it is likely due to the base cream formulation itself, which contains oils or emollients. Adding oil-soluble ingredients like Phytosterols to the oil phase of your cream formulation would also contribute to the overall feel. The other ingredients listed are primarily water-based or dispersible in water/glycols and would not typically cause a cream to feel oily on their own.

Product Shelf Life

There is a distinction between the shelf life of the raw ingredients and the shelf life of a finished product.

• The raw ingredients you listed generally have a shelf life of 2 to 4 years when stored correctly according to their specific instructions (e.g., cool place, refrigerator, room temperature, away from light and heat).
• The shelf life of a finished cosmetic product depends on its specific formulation, preservation system, packaging, and how it is stored and used. A common guideline for many finished products is around 1 year, but this can vary.

Regarding the "60-day syringe life" you mentioned, this likely refers to the recommended period for using a specific product after it has been opened or after mixing if it's a multi-component product, particularly when packaged in a syringe for precise application or to maintain stability for a limited time after activation. This 60-day limit is specific to that product in that packaging and is different from the raw material shelf life. Transferring the product to new packaging would not typically extend this recommended usage period if the limitation is due to the product's inherent stability or preservation system once opened or mixed.