Vitamins and Supplements.
If you take any vitamins or supplements each day – why not just throw them straight into your smoothie? Saves having to swallow them separately – a task some of us find quite hard.
This also goes for any oils you might be taking, and things like natural seaweeds, flax, any seeds, plant extracts, etc, that you might use.
A work of caution though. Medicines should not be treated in the same manner. Some medicines are engineered to dissolve at a certain rate and provide their payload over a period of time. Putting them in a blender could prevent this from happening. However, vitamins and supplements are not normally created in this fashion. If in any doubt – ask your doctor or your pharmacist.