Cancer is a disease that affects millions of people every year. The World Health Organization predicts that by 2020, there will be 15 million new cases of cancer every year.

While there are treatments available, they often come with many negative side effects. Fortunately, there are many natural substances that have been shown to have anti-cancer properties. Here are the top 30 natural anti-cancer substances.

1. Turmeric

Turmeric has been used for centuries in traditional medicine, and has been shown to have powerful anti-cancer properties. The active ingredient in turmeric is curcumin, which has been shown in studies to suppress the growth and spread of cancer cells.

2. Garlic

Garlic contains compounds that have been shown to have anti-cancer properties. These compounds work by activating enzymes in the liver that help to detoxify carcinogens, and also by inhibiting the growth of cancer cells.

3. Ginger

Ginger has been shown to have anti-inflammatory properties, which may help to reduce the risk of cancer. Ginger has also been shown to have anti-tumor properties, which may help to slow the growth and spread of cancer cells.

4. Cruciferous Vegetables

Cruciferous vegetables, such as broccoli, cauliflower, and kale, contain compounds that have been shown to have anti-cancer properties.

These compounds work by activating enzymes in the liver that help to detoxify carcinogens, and also by inhibiting the growth of cancer cells.

5. Green Tea

Green tea contains compounds called catechins, which have been shown to have anti-cancer properties. These compounds work by preventing the growth and spread of cancer cells, and also by promoting the death of cancer cells.

6. Resveratrol

Resveratrol is a compound found in red wine, grapes, and peanuts. It has been shown to have anti-cancer properties by inhibiting the growth of cancer cells and promoting the death of cancer cells.

7. Berries

Berries, such as blueberries and raspberries, contain compounds that have been shown to have anti-cancer properties. These compounds work by preventing the growth and spread of cancer cells, and also by promoting the death of cancer cells.

8. Leafy Greens

Leafy greens, such as spinach and kale, contain compounds that have been shown to have anti-cancer properties. These compounds work by activating enzymes in the liver that help to detoxify carcinogens, and also by inhibiting the growth of cancer cells.

9. Mushrooms

Mushrooms, such as shiitake and maitake, contain compounds that have been shown to have anti-cancer properties. These compounds work by activating the immune system to fight cancer cells, and also by inhibiting the growth of cancer cells.

10. Tomatoes

Tomatoes contain a compound called lycopene, which has been shown to have anti-cancer properties. Lycopene works by preventing the growth and spread of cancer cells.

11. Flaxseed

Flaxseed contains compounds called lignans, which have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

12. Seaweed

Seaweed contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

13. Citrus Fruits

Citrus fruits, such as oranges and grapefruits, contain compounds that have been shown to have anti-cancer properties. These compounds work by preventing the growth and spread of cancer cells.

14. Soy

Soy contains compounds called isoflavones, which have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

15. Red Grapes

Red grapes contain compounds called anthocyanins, which have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

16. Nuts

Nuts, such as almonds and walnuts, contain compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

17. Olive Oil

Olive oil contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

18. Onions

Onions contain compounds that have been shown to have anti-cancer properties. These compounds work by activating enzymes in the liver that help to detoxify carcinogens, and also by inhibiting the growth of cancer cells.

19. Black Pepper

Black pepper contains a compound called piperine, which has been shown to have anti-cancer properties. Piperine works by inhibiting the growth of cancer cells.

20. Sage

Sage contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

21. Thyme

Thyme contains compounds that have been shown to have anti-cancer properties. These compounds work by activating enzymes in the liver that help to detoxify carcinogens, and also by inhibiting the growth of cancer cells.

22. Cinnamon

Cinnamon contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

23. Cloves

Cloves contain compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

24. Honey

Honey contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

25. Pomegranate

Pomegranate contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

26. Licorice

Licorice contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

27. Rooibos Tea

Rooibos tea contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

28. Hemp Seed

Hemp seed contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

29. Dark Chocolate

Dark chocolate contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.

30. Apple Cider Vinegar

Apple cider vinegar contains compounds that have been shown to have anti-cancer properties. These compounds work by inhibiting the growth of cancer cells and promoting the death of cancer cells.