Herbal Shampoo Preservation

Regarding the issue of color and odor changes when using Phenonip® (product ID 893) with formulations containing herbal ingredients, the staff suggests that this is likely due to the inherent instability of fresh herbal components rather than the preservative failing to control microbial growth. Microbial contamination typically manifests as localized spots or rings, not a uniform change in color or odor throughout the product.

Yes, you can use Pentylene Glycol (product ID 2132) with Thyme Kill™ (product ID 1439). The recommended method is to dissolve 0.1% Thyme Kill™ in 3% Pentylene Glycol. Mix these two ingredients together completely before incorporating them into your main formulation. This ratio is expected to achieve full dissolution.

The staff did not provide a direct comparison of the effectiveness between the Pentylene Glycol + Thyme Kill™ combination and Phenonip®. However, they did provide a recommended usage level for Thyme Kill™ when dissolved in Pentylene Glycol. The most suitable preservative system may depend on the specific herbal extract used and its compatibility.

Concerning Phenonip®, the staff did not provide specific instructions regarding mixing it with water or the required ratio before adding it to your formula.