. undiluted thyme and oregano oils, for example, pose a risk of skin irritation. second, when essential oils are applied undiluted to the skin, percutaneous absorption may lead to relatively high constituent concentrations in the bloodstream, which increases the risk of systemic toxicity. wintergreen...
. undiluted thyme and oregano oils, for example, pose a risk of skin irritation. second, when essential oils are applied undiluted to the skin, percutaneous absorption may lead to relatively high constituent concentrations in the bloodstream, which increases the risk of systemic toxicity. wintergreen...