Should I use a nocking point with my string loop or is the loop secure enough to the string that I don't need a nocking point?

Thanks.

I have done it both ways. However, I would recommend using a nocking point for added security that the loop does not move any.

i have a nock point for security also

No I just use the loop if it is tied correctly then it is not going to move or come undone.

I have been using a loop for about five years now and I have never used a nocking point and I never had any trouble. I guess it depends on how good the loop is tied and the material used.

What kind of material is best?

I use a tied in nock set below my arrow and none above.