Review and Mixing Procedure for Stretch Mark Cream and Facial Serum Formula

Question

I would like to request a review and advice on the mixing procedure for two formulas:

Stretch Mark Reduction Cream for Legs:
- Cocoa Butter: 10%
- Rose Hip Oil: 7%
- Shea Butter: 5%
- Glycolic Acid: 7%
- Vitamin B5: 3%
- Vitamin B3: 5%
- Phenoxyethanol: 1%
- Pro Polymer: 2.0%
- Distilled Water: Balance
Could you please confirm if this formula is suitable and effective for reducing stretch marks? Also, please provide detailed instructions on the mixing process, especially considering the 7% Glycolic Acid.
Facial Moisturizing and Whitening Formula:

This formula is intended for facial use to provide moisture and whitening benefits. Could you please review its suitability for this purpose and provide any necessary advice?

Thank you.

MySkinRecipes Expert · Accepted Answer

Based on the discussion, the revised formula for reducing stretch marks on the legs is considered suitable and effective, particularly due to the inclusion of butters which help moisturize and protect the skin barrier. The staff confirmed its appropriateness.

Regarding the mixing process for the stretch mark formula, the staff provided detailed instructions, especially for incorporating the 7% Glycolic Acid, which can make emulsification challenging. The recommended method is to split the Glycolic Acid into two parts:

Oil Phase: Cocoa Butter (10%), Rose Hip Oil (7%), Shea Butter (5%)
Water Phase 1: Glycolic Acid (3.5%), Vitamin B5 (3%), Vitamin B3 (5%), Phenoxyethanol (1%), Pro Polymer (2.0%), Distilled Water (balance)
Water Phase 2: Glycolic Acid (3.5%)

Mix Water Phase 1 with the Oil Phase until a cream texture is formed. Then, add Water Phase 2 (the remaining 3.5% Glycolic Acid) in the final step after the cream is formed. The resulting cream may become slightly thinner; if it's too thin, you can add more Pro Polymer.

For the second formula you provided, intended for facial moisturizing and whitening, the staff confirmed it is suitable for this purpose. They advised reducing the concentration of Phenoxyethanol preservative because the Galactomyces Ferment Filtrate (Pitera) already contains a preservative.