To release the properties of herbs, most companies extract them with solvents leaving the plant extract useless. These solvents penetrate your skin's protective barrier and break down intercellular mortar. Many ingredients found in synthetic fragrance can irritate your skin and strip away its natural protection. Complaints to the FDA concerning fragrance include asthma, headaches, dizziness, rashes, brown spots, violent coughing, vomiting, and skin irritation. Preservatives have a tendency to become formaldehyde donors, releasing trace amounts of formaldehyde into the skin.
Many preservatives are cellular toxins.
Most important, formaldehyde causes discomfort to the joints and many other health issues. Synthetic pigments contain heavy metal salts and deposit toxins onto your skin. Many can be carcinogenic. Very few oils are cold-pressed, so oils turn rancid very quickly from the heat used in extraction. As your skin releases these oils, the sun becomes a catalyst, activating these rancid oils.