Adding Ingredients to an Existing Formula

You're asking about adding Myristyl Nicotinate and Phospholipid to an existing cosmetic formula containing Cyclomethicone, Sheep Placenta Extract, Caprylic/Capric Triglyceride, and Tocopheryl Acetate.

Based on the properties of these ingredients:

• Myristyl Nicotinate (Max-B3™) is oil-soluble.
• Hydrogenated Lecithin (a type of Phospholipid) is dispersed in oil.
• Cyclopentasiloxane, Caprylic/Capric Triglyceride, and Vitamin E (Tocopheryl Acetate) are also oil-soluble or soluble in oil/silicone.
• Sheep Placenta Extract is water-soluble.

Your existing formula contains both oil-soluble and water-soluble components, suggesting it is likely an emulsion. While the oil-soluble nature of Myristyl Nicotinate and the oil-dispersible nature of Hydrogenated Lecithin are compatible with the oil phase components of your formula, adding ingredients to a finished cosmetic product can be challenging.

Adding ingredients after a product has been fully formulated can potentially disrupt the emulsion stability, affect the texture, appearance, or efficacy, and may not ensure even distribution of the added ingredients. The method you described, slowly incorporating the Phospholipid and then the Myristyl Nicotinate, is a common technique for adding ingredients during the formulation process, but its effectiveness when adding to a finished product can vary greatly depending on the specific base formula.

Without knowing the complete details of your existing formula, particularly the emulsifier system and the precise percentages of all components, it is difficult to definitively say whether adding these ingredients will be successful and maintain the product's stability and performance. For best results and guaranteed stability, it is generally recommended to incorporate new ingredients during the initial formulation process rather than adding them to a finished product.