Took my first Rhodiola capsule, sadly I must say, I do not feel anything.

Is it a thing that one has to take for awhile to feel any change?
Maybe there are different dosages that will work?
I took one as bottle directs, one capsule consists of 340mg rhodiola root extract (3% Rosavins = 10.2mg)
I hope something kicks in, I took it about 2 hours ago.
Thanks everyone, who has replied to this post.
Larry, thanks for technical info. your help is always appreciated.
((((((((((( everyone )))))))))))