Body Lotion Formulation for Sun-Darkened Arms: Emulsifier, Mixing, and Ingredient Questions

Thank you for your question and for sharing your proposed formula. The team has reviewed your request and provided valuable feedback and a revised formula to help you create a body lotion for sun-darkened arms.

First and foremost, the team strongly emphasized the critical importance of adequate sun protection. Since the darkening on your arms is due to sun exposure, any whitening or exfoliating efforts will be ineffective or temporary if the skin continues to be exposed to UV rays without sufficient protection. Please ensure you are using a high-SPF sunscreen generously and reapplying as needed, especially when exposed to the sun.

Regarding your questions:

1. Emulsifier: You asked if Light Cream Maker could be used as the emulsifier for your formula containing both water and oil phases. The team advised that while Light Cream Maker can emulsify, given the significant amount of oil in your formula, Satin Cream Maker is a more suitable and effective emulsifier. Satin Cream Maker can effectively emulsify a higher oil phase without requiring heat, making the formulation process simpler.
2. Mixing Order: For the revised formula provided by the team, which uses cold-process emulsifiers, a suggested mixing order is as follows:
   • Step 1 (Water Phase): Combine the water and water-soluble ingredients (such as Natto Gum, Safe-B3™, Vitamin B5, Willow Bark Extract). Mix until fully dissolved and homogeneous.
   • Step 2 (Oil Phase): Combine the oil-soluble ingredients (like Argan Oil, Sym-White, Phospholipid). Mix until homogeneous.
   • Step 3 (Emulsification): Add the Satin Cream Maker to the water phase and mix well. Then, slowly add the oil phase to the water phase while continuously mixing. Continue mixing until a stable cream texture is formed.
   • Step 4 (Final Additions): Add the preservative (Phenoxyethanol SA) and any other heat-sensitive ingredients or fragrances if desired. Mix thoroughly.
3. Slim-Coffee™: You asked if Slim-Coffee™ would help with perceived muscle sagging. The team clarified that Slim-Coffee™ is primarily used for addressing cellulite and is not effective for muscle laxity. They also noted that Slim-Coffee™ is an electrolyte and can make the formulation more difficult for beginners, potentially causing the cream to thin or separate. For these reasons, it was removed from the revised formula.

Revised Formula (as suggested by the team):

• สารสกัดมะหาด (Oxyresveratrol) 5%
• Natto Gum 5%
• Safe-B3™ (Vitamin B3, Niacinamide) 5%
• Satin Cream Maker 2%
• Vitamin B5 2%
• Willow Bark Extract 3-5%
• Argan Oil (Organic - Virgin - Deodorized) 15%
• Sym-White 0.5%
• Phospholipid (Hydrogenated Lecithin) 3%
• Phenoxyethanol SA 1%
• Water (adjust to 100%)

The team reiterated that consistent and effective UV protection is essential for this lotion to achieve the desired results.