Will a Henna natural hair color from a health food store effectively cover gray?

Or are there any stronger versions of henna that will?Will a Henna natural hair color from a health food store effectively cover gray?
Henna powder you buy online will almost always be fresher, and be stored in a freezer, which preserves the dye. Old henna on a shelf won't stain as deeply.Will a Henna natural hair color from a health food store effectively cover gray?
Yes, but you have to know what your doing. There are like four kinds of henna. You need to do an internet search to find the right one for you.