Another recent addition is collagen (in the form of beef gelatin powder). As long as I don't add too many frozen fruits, the gelatin mixes fine and adds no taste. One scoop has about 18 grams of protein. It's been great for my nails, which are now stronger and smoother after including collagen in my diet for about a month. Collagen is an important element of bones, as is protein. Studies have shown a link between lack of collagen in facial skin, and lower bone density. There's not a ton of academic research on the effectiveness of collagen supplements on bone density, but it seems to make sense that it would be helpful.
The other ingredients in my breakfast smoothie are kefir (for protein, calcium and probiotics), a dash of orange juice (for Vitamin C and good taste), Whey protein (also has calcium), a tablespoon of coconut oil , baby bok choy (great source of calcium that is easily absorbed), and anti-oxidant powerhouse: blueberries.
The blended drink does look green, but still tastes good. If you add raspberries, it will turn pink.
Here's to a healthy way to start the day!