Rosemary, a commonly used spice and herb, generally has no side effects or contraindications in regular dosages. However, in high doses or in cases of allergies, the following side effects and contraindications may occur:

Side effects:

1. Skin sensitization or local irritation.

2. Produces gastrointestinal symptoms such as nausea, vomiting and headache.

3. Prolonged application in large quantities may cause damage to the liver.

4. Pregnant and lactating women should not consume large amounts.

Contraindications:

1. Allergic to rosemary is prohibited.

2. Pregnant women should avoid using it due to its effect of stimulating uterine contractions.

3. It should not be used in large quantities for a long time for patients with blood disorders.