Herbs and spices have been used for centuries for their healing properties and flavor. Modern research has found evidence for numerous health benefits of herbs and spices. Here are some of the world's healthiest herbs and spices, supported by research:

1. Cinnamon: Lowers blood sugar levels and has a powerful anti-diabetic effect ¹.

2. Sage: Can improve brain function and memory, especially in individuals with Alzheimer's disease ¹.

3.Peppermint: Relieves IBS pain and may reduce nausea ¹.

4. Turmeric: Contains curcumin, which has potent anti-inflammatory effects and is a strong antioxidant ².

5. Ginger: Has anti-inflammatory and antioxidant properties and may help relieve pain and nausea ².

6. Garlic: Contains compounds with potent medicinal properties and may help lower blood pressure and cholesterol levels ².

7. Rosemary: Contains carnosic acid, which has been shown to fight cancer cells ³.

8. Thyme: Contains thymol, which has antibacterial properties and may help treat respiratory infections ³.

9. Oregano: Contains carvacrol, which has antimicrobial properties and may help fight infections ³.

10. Basil: Contains eugenol, which has anti-inflammatory and antioxidant properties and may help protect against cancer 

Remember, herbs and spices are not a substitute for medical treatment. If you have a medical condition, consult your doctor before using herbs and spices as a supplement.