I use Utiva cranberry supplements. Utiva Maintenance for Control. Each capsule has 36 PAC's per capsule. You can buy it on Amazon where you can also read the reviews. I use 1 Utiva capsule twice per day along with 500 mg Vitamin C and 1 gram of Methenamine Mandelate. Methenamine is an anti-infective (not an antibiotic) which does not become resistant. This regimen works very well and was recommended by Mayo.