Megan Roup's Must Haves: From Pregnancy-Safe Retinol to Dance-Cardio-Approved Sneakers

Roup has been using the Seed DS-01 Daily Synbiotic ($50) for nearly four years. It's a combination pre- and probiotic, which means it contains both good gut bacteria strains as well as the food they need to thrive.

"What I love about Seed is they're so like scientific and very transparent about what they're putting into their product," Roup says. Seed contains 24 clinically and scientifically studied probiotic strains and a prebiotic created from Indian pomegranate.

"Gut health to me is so important because it's so connected to your overall health. It's your second brain," she says.

Pro Tip: The exact best time to take a probiotic is debated among experts. However, some research shows that taking a probiotic 30 minutes before or when starting a meal — and particularly one that includes fats — increases absorption.