Proposed Back Spray Formula for Acne Marks

Your proposed formula for a back spray targeting acne marks is well-designed and includes several effective ingredients for reducing hyperpigmentation and improving skin tone. It is feasible to create this as a liquid spray.

Here's a breakdown of the ingredients and their benefits for treating dark marks:

• Azelaic Acid (Liquid Azelaic™): This ingredient is known for its ability to brighten skin and reduce dark spots. Your proposed concentration of 10% is within the recommended usage rate for this purpose.
• Safe-B3™ (Vitamin B3, Niacinamide): Niacinamide is excellent for reducing hyperpigmentation, improving skin barrier function, and reducing inflammation. The 5% concentration is a commonly used and effective level.
• GlucoBright™ (Acetyl Glucosamine): This works synergistically with Niacinamide to enhance skin brightening and reduce dark spots. Your 4% concentration is appropriate, especially when combined with Niacinamide.
• Natural Betaine and Glycerin: These are effective humectants that help to hydrate the skin. Maintaining skin moisture is important for overall skin health and can support the healing process of marks. Your adjustment of Natural Betaine to 5% should help reduce potential stickiness in a spray format.
• Phenoxyethanol SA (Optiphen Plus): This is a necessary preservative to keep your formula stable and safe.

This combination of ingredients directly targets the reduction of dark marks through multiple pathways, including inhibiting melanin production and supporting healthy skin cell turnover. The formula's composition is primarily water-based with soluble ingredients, making it suitable for a spray application, assuming you use a spray head designed for low-viscosity liquids.

Regarding your goal of clearing marks within 4 months, this is a realistic timeframe for seeing significant improvement with consistent use of this formula. The rate of fading can vary depending on the individual and the severity of the marks, but the ingredients you've chosen are well-regarded for their effectiveness in treating hyperpigmentation.

Recommendations:

1. pH Adjustment: Ensure the final pH of your formula is adjusted to a skin-compatible range, ideally between 5.0 and 6.0. This range is generally suitable for the stability and efficacy of the active ingredients and the preservative.
2. Spray Bottle: Use a spray bottle with a fine misting head designed for low-viscosity liquids to ensure even application on the back.
3. Sun Protection: While treating marks on the back, protect the area from sun exposure, as UV radiation can worsen hyperpigmentation. Wearing clothing that covers the area is advisable.
4. Consistency: Apply the spray consistently as part of your daily routine for the best chance of achieving your desired results within the 4-month period.

Your formula is a strong approach to tackling post-acne hyperpigmentation on the back. With proper formulation techniques and consistent use, you should see good progress.