Soy Protein Isolate

I order mine from myprotein website. Right now the soy protein isolate is going for 6680 for 2.5kg bag.

They also have other options. The cheapest one is Pea protein isolate, 5600 for 2.5 kg. They have the cleanest options for proteins. Just remember that as it comes as an international delivery you need to order Above 12000 for free delvery, 6000 for 450 yen delivery fee If below that then 1800 delivery fee.

MyProtein Soy Isolate with vanilla flavor

My comment got deleted because I included a link, so here without the link: Myprotein has a neutral 100% soy protein isolate (they also have pea, but I haven't tried that), which is great for smoothies with (frozen) fruit, but can also be used as a sauce thickener in meals. No artificial flavors and sweeteners, so it's very versatile and almost completely flavorless.

The flavorless soy isolate from both Bulk and MyProtein are great. Just blend with soy milk and some frozen fruit and you have what you need without the horrible artificial taste.

hands down myprotein soy protein isolate, super chalky and viscous and taste bad…

I love MyProtein (the soy isolate salted caramel or the vegan blend cereal milk/chocolate salted caramel are really good) but I'm in Europe so idk if it's available for you. I also like Prozis, they have a good hazelnut one called bonbon something (ferrero rocher-like) and ive had others from HSN that were not bad either