Looking for a Super Green/Super food powder recommendation

I want to get back on track making fruit and Greek yogurt smoothies for my family. I know it’s not a cure but I feel like we could all use some extra fruits and veggies to help our immune system (these last few months we all either have a head cold or chest cold). We already always take vitamins and have fruits / veggies with most of our meals but I’m needing to try something to help even more, if possible. I don’t want more supplements but just want to try utilizing fruits and veggies.

None of us like when I add spinach (fresh or frozen) to the smoothies. It never blends in right and is still chunky. I have an older blender which I’m sure is part of the problem. But I’ve really been thinking about adding a Green Powder instead for the veggies. I am trying to do my own research but would also like some recommendations from people that have tried and loved some super food / super green powders please.