Ask the soap maker. Look for soaps made with real essential oils which are extracted from plants that are safe and therapeutic when used properly. The are more expensive, but well worth it in terms of your health and the health of our planet. If the label just says “fragrance”, “perfume”, or “parfum” it’s probably a fake synthetic scent. Other synthetic additives to avoid are FD&C colors, dyes, antibacterial triclosan & triclocarban, EDTA, TEA, DEA, sodium laureth and sodium lauryl sulfates, to name a few. They’re not kind to your skin, your health or our environment.