M&S Wholemeal Tortilla Wraps Made from wholemeal wheat flour, these wraps are a natural source of Vitamin D and fibre. Serve with your favourite filling. Serve warm or cold. Microwave, oven-bake or pan-fry to serve warm. Eight per pack. All of our breads are a natural source of Vitamin D and Fibre, two nutrients that are naturally low in our diets. We use a natural source of Vitamin D that is produced by yeast, which is why you will find ‘yeast’ on our list of ingredients, not because we use it as part of the dough making process.