Toner Formula for Oily Skin with Salicylic Acid and Witch Hazel

Based on the staff's reply, your toner formula seems viable.

Here's a summary:

• The formula is possible to make.
• You do not need to add an extra preservative. The Witch Hazel (Distilled - Alcohol Free) is used at a high concentration (88%) and contains its own preservative.
• The staff recommends adding Safe-B3 (Vitamin B3 / Niacinamide) at 5%. This can help your skin tolerate the Salicylic Acid better and further assist in reducing skin oiliness.

The ingredients you've chosen (Salicylic Acid, Licorice Extract, Zinc PCA, Witch Hazel) are generally known for properties that align with your goals of reducing oil, controlling oil, reducing clogged pores, and potentially helping with pore appearance.