Homemade SCD GAPS Diet Mayonnaise is so easy to make and so much better than store-bought. Have you ever read the ingredient label on a jar of mayonnaise? Here's the ingredient label for a popular mayonnaise brand (their olive oil version): WATER, SOYBEAN OIL, OLIVE OIL, WHOLE EGGS AND EGG YOLKS, MODIFIED POTATO STARCH, VINEGAR,