I took a deep dive on my hunt for the best greens powders, speaking with dietitians and trying popular brands to uncover whether or not they're worth the money. Spoiler alert: Greens powders aren’t harmful, ultimately, but the dietitians I spoke to agreed that they're not a replacement for a healthy, varied diet. Greens powders are an expensive product that may or may not help your various woes. Greens powders make me consider my choices carefully all day long. I think greens powders make sense for me as a supplement, but I refuse to be separated from my kale salads and fruit plates.