Prolonged use brings a risk of burning of the mucous membranes, and possible upset of gut flora. Overconsumption can cause possible liver or kidney toxicity.
If you are taking homeopathic remedies do not use black pepper, camphor, eucalyptus, peppermint, rosemary, or spearmint.
Hydrosols are usually used by spraying for things like air fresheners, deodorant or body spray .
There are many safe oils that are helpful in reducing high blood pressure. Among them are: Bergamot, Lemon, Melissa, Neroli/Orange Blossom, Orange, and Yarrow
There are many other safe oils that can be very helpful for diabetes. Among them are: Sweet Birch, Cinnamon, Clove Bud, Eucalyptus and Ylang Ylang.