Chanterelle mushrooms are high in specific vitamins and minerals despite their 90% water content. One 3.5-ounce serving (about a handful) of chanterelle mushrooms is high in B vitamins, especially niacin (B3) and pantothenic acid (B5). These mushrooms are a good source of manganese and potassium. Chanterelle mushrooms nutrition gains, per serving, are as follows: Vitamin D: 35%. Iron: 27%.  Carbohydrates 7%. Dietary fiber 1.4%. Protein 1.5%.