There doesn't seem to be much a chinchilla won't do for a raisin. Again the rule is moderation, only three or four raisins per week, and even less for youngsters. In fact, for young chinchillas, don't even give them a whole raisin, only a half at a time. An occasional raisin also helps to prevent constipation in chinchillas. Dried fruit, provided it doesn't have sulfite preservatives, can also big on a chinchilla's hit parade.
Sunflower seeds are a great treat and can add sheen to a chinchilla's coat.
Buy the raw black oil sunflower seeds available for bird feeding. Some chins learn to take the seed from the shell, while others eat the shell and all, without bad effects. Try different treats from time to time and before long your chinchilla will have taught you its likes and dislikes. Another item that should be mentioned with regards to dietary supplements is wood. Chinchillas are rodents and, therefore, have large , strongly recurved incisor teeth that grow throughout their life.