On Doctoring MEDLINE searches, with reference librarian comments

The question was

What I'm looking for:

A patient is curious about the use of phosphocreatine as a dietary supplement - he/she is curious if it is efficacious and safe to use.

What does the literature say about the use of phosphocreatine
as a dietary supplement for athletic
enhancement?

What are the side effects, if any?

1 :  exp Phosphocreatine/ae [Adverse Effects]         {1}
2 :  exp Phosphocreatine/         {5225}
3 :  Muscles/         {114733}
4 :  exp muscles/ or exp "physical education and training"/ or         {362450}
exp physical fitness/ or exp sports/ or Physical endurance/
or Running/ or Sports medicine/
5 :  Dietary supplements/ or Muscles/         {115397}
6 :  2 and 3         {1225}
7 :  2 and 4         {3111}
8 :  2 and 5         {1229}
9 :  6 and 7         {1225}
10 :  6 and 8         {1225}
11 :  7 and 8         {1229}
12 :  Body composition/ or Creatine/ or Exercise/ or Muscles/         {140286}
13 :  "PHOSPHOCREATINE SUPPLEMENT".mp.         {0}
14 :  "ATHLETES".mp.         {6931}
15 :  Phosphocreatine/ or "phosphocreatine".mp.         {6498}
16 :  14 and 15         {25}
17 :  "CREATINE PHOSPHATE".mp.         {1760}
18 :  14 and 17         {9}
19 :  from 16 keep 1-25         {25}
20 :  from 16 keep 1,4,6         {3}
21 :  from 18 keep 1,3         {2}
22 :  20 or 21         {4}
23 :  from 22 keep 1-4          {4}

Reference Librarian comments

It's clear that you were bopping around, having lots of MEDLINE fun.
Did you finally end up with interesting references? The only idea I
had would be a different approach altogether, something like:

1 : 
exp *Phosphocreatine/
357

2 : 
limit 1 to (human and english language and review articles)
2

...but this didn't get very much. Interesting topic, to be sure. It
would be fun to use a SPORTS database for this one also...

Good job. Congrats!