Glycolic Acid Toner Formula Review and Improvement

Based on the conversation, the staff has reviewed your revised formula using percentages by weight and provided suggestions.

Here is the recommended formula and the staff's advice:

Recommended Glycolic Acid Toner Formula (by weight):

• Glycolic acid: 3%
• Aloe vera extract: 3%
• Mild Preserved Eco (preservative): 1%
• Water: 93% (adjust if adding Ethoxydiglycol)

Optional Addition:

• Ethoxydiglycol: 3-5% (If added, reduce the amount of water accordingly to keep the total at 100%). This ingredient helps improve skin penetration.

The staff also initially advised using units of weight (grams) instead of volume (ml) when formulating.