Natural Preservatives for Sulfate-Free Shampoo

Replacing Phenoxyethanol with a natural preservative in a sulfate-free shampoo requires selecting an ingredient that is effective against a broad spectrum of microbes (bacteria, yeast, and mold), is water-soluble, compatible with the shampoo's pH range, and can withstand the manufacturing process temperature.

Here are some natural or naturally derived preservative options suitable for sulfate-free shampoo formulations:

• NaturePreserve™ LB2: A liquid, water-soluble preservative effective in a pH range of 2.0-6.5. It offers broad-spectrum protection and is suitable for hair care products. Avoid heat above 50°C during addition.
• Coco-Preserve™: Derived from coconut extract, this liquid preservative is water-soluble and works well in a pH range of 4-8. It provides broad-spectrum control. Avoid heat above 50°C.
• Global Guard™ 221: A water-soluble liquid preservative effective in a pH range of 2-7. It is a broad-spectrum option. Add when the product temperature is below 45°C.
• PaeoniaPreserve™: A natural liquid preservative extracted from Paeonia root. It is water-soluble and effective in cosmetic formulations. Avoid heat above 60°C.
• Probio-Protect™: A probiotic-derived liquid preservative (Lactobacillus Ferment) that is water-soluble. It also offers moisturizing benefits. Avoid heat during mixing.
• Preserve-BSB™: A blend containing Benzyl Alcohol, Sodium Benzoate, and Potassium Sorbate. It is water-soluble and effective up to pH 5.5. It can withstand temperatures below 80°C.
• NaturePreserve™ Ultra: A powder form of Gluconolactone and Sodium Benzoate. It is water-soluble and works in a pH range of 3-6. It is heat tolerant.
• Thyme Care™: A natural liquid preservative derived from Thyme and other plant extracts. It is effective in a wide pH range (2-10) and can withstand heat up to 80°C for a short time. Note that it has a natural thyme scent which might affect the final product fragrance.

When choosing, consider the target pH of your sulfate-free shampoo formula and the maximum temperature during production. Always perform a challenge test on your final formulation to ensure the chosen preservative is effective at the intended usage rate and conditions.