I haven't been taken them long, but so far so good. It mixes well in my morning fruit smoothie. I wouldn't say that it's completely tasteless, but I believe it's just the vitamin C that gives it a bit of a citrus flavor if you taste the powder alone. Of course there's fruit in my smoothie so I'm that sense I'm taking it with food so I haven't had any trouble with it upsetting my stomach. I would recommend it. Oh, be aware that it's a very small tub, but the scooper for one serving is also very small so it makes sense.