513+ Happy Runners
The #1 Doctor & Dietician Reviewed Probiotic for Runners
513+ Happy Runners
The #1 Doctor & Dietician Reviewed Probiotic for Runners
Gastroenterologist, dieticians, coaches and health experts recommend MAS Flush for it’s unique approach to gut health and the unique GI issues endurance athletes face when training and racing.
Independent Reviews
Clinicians and dieticians receive product samples, but are never compensated for their reviews
Dr. Michael Torres, MD
- Gastroenterologist
What impressed me about MAS Flush is the inclusion of New Zealand blackcurrant, which is not something general probiotics include and shows how dialed in this formula is for endurance athletes. If you're an endurance athlete looking to improve gut health, there's no better option suited to your needs.
Highlights
- Formulated for endurance
- Cutting-edge formula
Maria Santos
- RRCA Certified
For newer runners, GI issues can be the thing that makes them quit the sport entirely. I've had athletes tell me they mapped every public bathroom within a 5-mile radius of their house. That's no way to enjoy running. What I like about MAS Flush is how straightforward the protocol is. It's not asking athletes to overhaul their diet or try complicated timing strategies. For the average runner who just wants to enjoy a Saturday morning group run without fear, this kind of simple solution can be transformative
Highlights
- Easy to add to your routine
- Prevents bathroom issues
Dr. Sarah Chen, MD
- Gastroenterologist
Many of my running patients come to me frustrated by unpredictable bowel patterns that interfere with training. The inclusion of psyllium husk at a clinically meaningful dose helps reduce these issues significantly. The fact that MAS Flush builds this into its probiotic shows they understand the physiology behind the issues runners face.
Highlights
- Prevents runners trots
- Efficacious dose
James Whitfield, RD, LD
- Clinical Dietitian
Endurance athletes have paradoxically high caloric needs but often struggle with digestion. The digestive enzyme blend in MAS Flush is thoughtfully formulated to target the specific macronutrients that cause the most digestive burden for endurance athletes. My only suggestion would be to take it consistently, as enzyme support works best when the gut environment is primed.
Highlights
- Improves digestion
- Take consistently
Rachel Nguyen MS, RD
- Sports Dietitian
One of the biggest challenges I see with marathon and ultra athletes is the inability to absorb adequate carbohydrates during racing. For athletes who've resigned themselves to reduced fueling because 'my stomach just can't handle it,' this could be help a lot. I'd recommend starting supplementation 4-6 weeks before a goal race to allow the gut microbiome to adapt.
Highlights
- Unique formula
- Useful in training & racing