Question (new to this) Help if possible

So I just signed up for a Federal Spending Plan. Allows me to put money in an account for a year that is tax free that I can use towards my medical expenses. I spend roughly $2610 in medical (co-pays, vits, protein, perscriptions,bc)

Question 1:
If I get my PCP to write a letter of necessity for my vits and protein, can this be covered?

Question 2:
Has anyone used this before, can you share?

You need to  check with your plan.  I've used an FSA for years.  However, the laws changed so that it's tougher to get some things covered.  My plan said if I had a letter of medical necessity for vitamins, they were covered.  I never submitted a claim because my few prescription drugs and office visit co-pays were easier to file.  It seems that within the Federal Guidelines, individual plans can determine what they will pay for and what they won't.  They also vary in what documentation they need to support the claim.

Last year, I saved $400 in taxes.  That's a lot of bacon and prime beef