| http://www.w3.org/ns/prov#value | - In addition to supplements, papaya, red bell peppers, oranges, Brussels sprouts, and cantaloupe are all excellent sources of vitamin C. To bolster your immune system with beta carotene, eat plenty of leafy greens such as spinach, romaine lettuce, broccoli, and kale, and orange produce including sweet potatoes, carrots, and squash.
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