I'm pretty sure the cans may even use BPA which is definitely best avoided when possible.There are much better animal protein options available,for example dried mealworms(bird/reptile section in pet stores,also the wild bird section of various stores such as Walmart,K-Mart,Home Depot,and I believe Target as well to name a few!).
As for alternatives to mealworms,there are also dried crickets and dried freshwater shrimp.Shrimp are very high in protein but unlike mealworms have much less fat,so in some cases they could be the better choice for some hamsters(mostly obese hamsters,the healthy fats are great for underweight hamsters or those who need extra healthy fats in their diet).I use freeze dried chicken,and there are tons of different brands to choose from with that as long as you only use reputable brands.I'd recommend getting this sort of thing from Chewy though in the US,as they tend to have the best prices with mostly high quality foods and treats at least for dogs(they do carry some junk though,and brands which are definitely not safe,so do your own research as well as you always should!).
You could also try certain dog biscuits for extra protein,but you have to be extremely careful as so many contain unsafe ingredients
For example,Purina and Pedigree do use biproducts(unspecified therefore unsafe as they can be pretty much anything including but not limited to slaughterhouse waste and roadkill)along with unspecified liver(again,source unknown so it could come from anywhere including unsafe sources)for example as well as BHA/BHT which is known to cause cancer.Understanding what ingredients really mean is crucial,otherwise you can easily end up using unsafe things without knowing it which is all too easy