There is a lot of fluffy info out there and I have used OTC remedies with limited success.
Someone suggested dark sour cherries. So I got a pound of dark sour cherries and ate them all. Then I had gout and diarrhea. Not a good combination of having to poop right now and not have the mobility to make it to the loo in an expedient manner.
The fish thing seems to hold true for me. I can eat fish just fine, but I started taking Fish Oil for blood lipids and it gave me the worst gout ever: Toe, ankle, knee, and hip all at the same time.
Cruciferous veggies they say are bad; cabbage, cauliflower, brussels sprouts, etc. Didn't seem to bother me.
The worst seems to be alcohol and big quantities of red proteins like beef. It used to be that if I had a steak and a couple beers I knew it would cause problems. Also I suggest taking an anti-inflammatory for small injuries. If you stub your toe, take ibuprofen or aleve. It might prevent a flare up.
I'm on a steady diet of alopurinol (100mg/day) and haven't had a flare up for a few years. I've had some very mild pain that I suspect was gout, but the alopurinol's job is to lower uric acid levels so injuries, inflammations, and otherwise optimum conditions for a flare up won't cause crystallization and a flare up.
I finally turned to alopurinol because natural remedies weren't working and I was taking 1600mg of ibuprofen a day when I had a flare, suffering through it, and likely causing future arthritic problems. I figured the alopurinol A) was more helpful than potentially harmful, B) didn't have one of those class-action legal commercials, and C) was cheap and effective.
IIRC, the correct test numbers for Uric Acid are under 7 whatevers. Mine were around 12, meaning that anytime conditions were right I would get a flare up. I started on 200mg/day alopurinol and they dropped to 6. Now I'm down to 100mg/day and haven't had my numbers tested but its been years since a bad flare up so I call it a win regardless of the numbers.
I will say this: I have no proof either way, but celery seed extract may have worked a couple times for me. Not sure if it was the celery seed extract, or if it was just a short flare up, but superficial evidence suggests it may have shortened the flare up.