What is the best juice to use in smoothies?
What is the healthiest thing to put in a smoothie?
Protein, such as a commercial protein powder, Greek yogurt (which is higher in protein than regular yogurt) or nut butters.

Fruit, including berries, mango, bananas and avocado.
Greens, such as spinach or kale.
A liquid base such as dairy or plant-based milk, water or fruit juice.