Keep facial leave-on products under 0.5%, body leave-on under 1%, and rinse-off blends under 3%, adjusting for age and health. Avoid oils problematic for pets, and store finished refills in cool, dark places. When unsure, go unscented and invite household feedback before scaling batches or gifting widely.
Water-based blends spoil quickly without care. Reduce risks by mixing small volumes, disinfecting bottles with alcohol, and monitoring pH where relevant. Consider potassium sorbate, sodium benzoate, or alcohol for certain formulas, and refrigerate facial mists. Clean scoops, tight caps, and clear dates dramatically extend quality and peace of mind.
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