I've read (didn't bookmark the source, though) that folate (folic acid) is also important for us oldsters trying to avoid increased "senior moments." It supposedly helps the brain function.

I guess I should have mentioned that while you won't get scurvy on a week's backpack, it's a good idea to take a supplement containing Vitamin C for anything longer. The exception would be if you use an electrolyte drink mix that contains sufficient Vitamin C.
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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey