Rapid Tone Your skin makes vitamin D upon exposure to sunlight, so getting a few minutes of sun exposure each day helps increase your vitamin D levels. You can also boost vitamin D by eating food sources of the nutrient, such as canned salmon, dairy products or fortified cereals. Vitamin C Each of the tissues in your digestive tract contains collagen, a protein that helps hold your tissues together. Your body makes new collagen molecules to keep your tissues strong and relies on new collagen production to help heal tissue damage.

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