Is a supplement that combines grape seed, ginseng, and goji safe to use with gingko biloba 400mg and fish oil?
Yes if no problems. If you are healthy, have good liver function, and are not undergoing any surgical procedures. Those substances should be fine to combine, although there are no studies of that particular combination.
Supplements. That's a lot of stuff to mix. When you mix lots of things you can't count on safety.