Rosemary (Rosmarinus Officinalis) – The essential oil from this popular herb helps to firm and tone your skin. Rosemary offers a detoxifying effect while also increasing blood flow and general skin health. Rosemary oil has disinfectant, cleansing and anti-ageing properties and can be used to treat conditions including dermatitis, acne and eczema. Rosemary is a perennial herb native to the Mediterranean region.