- Tofu (1/2 cup, firm) 258 mg.
- Spinach (1/2 cup, canned) 136 mg.
- Artichoke (1 medium) 135 mg.
- Rhubarb (1/2 cup, unsweetened) 133 mg.
- Beet greens (1/2 cup) 82 mg.
Honorable mention: Kale, beans, chickpeas, pumpkin, and sweet potatoes have 30 to 50 mg. per serving.
DV: Children: 800 mg.; Adults: 1,200 mg.