Colace Regular Strength Stool Softener capsules gently soften hard and painful stool for a number #2 that's easy to do. Colace Capsules are the #1 Doctor recommended stool softener brand and have been trusted by doctors and patients for nearly 60 years to relieve occasional constipation. Gently softens stools: Colace Regular Strength Stool Softener capsules gently soften hard and painful stool for a number #2 that's easy to do.