USDA-derived comparison
Kelp (Seaweed) vs Spinach
Kelp (Seaweed) leads for Magnesium; Spinach answers with Vitamin K, Vitamin C and Vitamin A.
Who each is for: Choose kelp (Seaweed) for magnesium. Choose spinach for vitamin K and vitamin C.
Reviewed 20 July 2026. Generic food data per 100g; brands and preparation vary.
Spinach
Typical serving: 2 cups (60g)
27/100
Side by side, per 100g
The stronger number is highlighted, honestly: higher wins for aim-for nutrients, lower wins for stay-under ones like saturated fat and sodium.
| Nutrient | Kelp (Seaweed) | Spinach |
|---|---|---|
| Calories | 43 kcal | 23 kcal |
| Protein | 2 g | 3 g |
| Carbs | 10 g | 4 g |
| Fat | 1 g | 0 g |
| Fiber | 1 g | 2 g |
| Sat fat | 0 g | 0 g |
| Sodium | 233 mg | 79 mg |
| Potassium | 89 mg | 558 mg |
| Calcium | 168 mg | 99 mg |
| Iron | 2.9 mg | 2.7 mg |
| Magnesium | 121 mg | 79 mg |
| Zinc | 1.2 mg | 0.5 mg |
| Vitamin C | 3 mg | 28 mg |
| Vitamin D | 0 µg | 0 µg |
| Vitamin B12 | 0 µg | 0 µg |
| Folate | 180 µg | 194 µg |
Servings differ: a 10g portion of kelp (seaweed) is about 10g, 2 cups of spinach about 60g. Scale accordingly before deciding anything on the 100g basis alone.
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