Red, yellow, green and orange sweet peppers are all a great option to partially gutload with. Here's a list of other items you might try. The information is found in the resources section at the top of the home page:
Best - These gutloading ingredients are best because they are highest in calcium, low in phosphorus, oxalates and goitrogens. They should be the primary components of your gutload: mustard greens, turnip greens, dandelion leaves, collard greens, escarole lettuce, papaya, watercress and alfalfa.
Good - These gutloading ingredients are good because they are moderately high in calcium and other vitamins/minerals. They should be used in addition to those from the previous category: sweet potato, carrots, oranges, mango, butternut squash, kale, apples, beet greens, blackberries, bok choy and green beans.
These fresh fruits and vegetables can be combined with dry gutload mixes or home made mixes for optimal well-rounded nutrition. Dry ingredients can include: bee pollen, organic non-salted sunflower seeds, spirulina, dried seaweed, flax seed and organic non-salted almonds.
Avoid These Ingredients
Avoid these gutloading ingredients because they are low in calcium, high in phosphorus, goitrogens or oxalates: potatoes, cabbage, iceberg lettuce, romaine lettuce, spinach, broccoli, tomatoes, corn, grains, beans, oats, bread, cereal, meat, eggs, dog food, cat food, fish food, canned or dead insects, vertebrates.
Vertebrates (pinkies, lizards, etc.) are not a notable part of a chameleon's normal diet in the wild. Too many animal proteins in the diet of an animal that's not a carnivore can wreak havoc on their kidneys leading to kidney damage and gout due to the difference in protein breakdown. Everything your chameleon needs can be obtained through an all-insect diet with good gutloading and supplementation.
Thank you for your quick replies! I've already had a read at the resources bit but couldn't see any mention of peppers so just wanted to ask peoples opinions about them here