This is why you shouldn't take "pellets" of anything. If you don't know what they are, either get rid of them, or put them aside in a cool, dark place until you can get some marquis reagent to test them. Even if you test them with reagent, you still won't be 100% sure of what they are.
The first thing to do would be to contact the vendor you got them from, and just ask them. It is a perfectly reasonable thing to ask, so they shouldn't have a problem answering it. If you do find out what they are, and how many milligrams of active compound each one contains, then it is your choice whether to take them or not. However, you must be aware that - because they are in pellet form - you won't know the true dosages you are taking because you cannot weigh the active compound separately from the filler, and you should start with a minimal "dose" in order to find out what works for you.