I have looked at some things on the internet.
I think I would rather take the capsules because they are easier to dose and require less effort.

They seem to have many healthy properties, but that doesn't convince me. For vegans it might be a superfood, but as an omnivore in Europe I have enough better alternatives with domestic fruits, vegetables, legumes and meat to cover vitamin B, iron and protein.

Especially with protein it gets critical mmn. You only consume 10-15g a day as far as I have read. Let's let the 10g be protein per day. That is nevertheless only 10% of the total requirement.

I am always critical of these courted superfoods and always like to look at many sources and many opinions. Unfortunately Spinulina could not convince me here.