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The most common use for rosemary is cooking the herb to spice dishes such as spaghetti, or lasagna. Rosemary can also have medicinal purposes when used in herb form. Rosemary oil can be used for aromatherapy and baths. There are benefits to using Rosemary oil but there are also some potential side effects.


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Rosemary oil should never be internally consumed or ingested in any way. Rosemary oil can be toxic if taken orally because it contains camphor and other toxic chemicals. If taken orally rosemary oil can cause epileptic convulsions, kidney damage, digestive problems, and death. Because of this, rosemary oil should only be used externally. If Rosemary oil is ingested seek medical attention immediately.

Blood Sugar Levels

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Rosemary oil may raise blood sugar levels, but can be dangerous in patients with diabetes or hypoglycemia. If you have diabetes or hypoglycemia ask your doctor before using rosemary oil. If you are using rosemary oil and suspect it may be raising your blood sugar, check it immediately and if so, contact a physician.

Skin problems

According to, rosemary oil can cause dermatitis, or other skin problems.

Allergic Reactions

If you use rosemary oil and have an allergy to it, you could develop a rash or even have an asthma attack.

Hair Growth

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Rosemary oil has been known to cause hair growth. This may be a good thing if you desire longer hair. If this is not your intention, then being aware of the possibility may be good to know before you choose to apply rosemary oil to the scalp or use it in a bath.

Musculoskeletal Effects

Even though it has not been studied often, musculoskeletal effects may be linked to the use of rosemary oil.

About the Author

Naomi Vogel

Naomi Vogel started writing professionally in 2009. Vogel has written for "Volume One," "The Leader Telegram," "Spiral Natural Foods" and "The Student Voice." Vogel has a bachelor's degree in journalism and theater from the University of Wisconsin-River Falls. Vogel received the Journalism of Excellence Award from her university in 2010.