@SarahGen-- Ginseng comes in many different forms like capsules, powder, tea, liquid vials, etc.
I think they're all effective. Potency may vary depending on how much ginseng the supplement contains, where it was cultivated, how fresh it is, etc. I personally drink Korean red ginseng tea and I think it works very well. The tea is just dried ginseng root that's steeped in hot water.
If taste is a concern for you, you might want to take the capsule supplements. If you like the taste, than the tea or the liquid vials are good options. Korean ginseng products are very nice. Korean and Chinese red ginseng are supposed to be the best of all ginseng.