What supplements should be avoided before a procedure?

Hello Akeyna,This is a great question and kudo's to you for doing your due diligence.  I provide my patients with an extensive list of vitamins and herbal supplements to avoid that may make them more prone to bleeding or bruising.  Common culprits are Vitamin E, Fish oil or Omega3 supplements, glucosamine, garlic, but the list is much more extensive than this.  For over the counter medicines, anything containing aspirin or NSAID's (ibuprofen, advil, aleve, etc.).  Tylenol does not affect your blood clotting, so it is safe to take perioperative for aches and pains.  Ask your surgeon what you need to discontinue.  Good luck with your procedure!   I hope this is helpful.
All my best!  Dr. Elizabeth
AtlantaFaceAndBody.com
"This answer was solicited without seeing the person, and should not be construed as medical advice."

In addition to Dr. Walker's list, bilberry and
high doses of vitamin C could affect clotting.
Because we do not know all potential offenders
I found easier to stop all optional supplements 
2 weeks before surgery and resume 2 weeks 
after surgery. Best wishes.