Product Description
You've dialed in your training plan, but your gut hasn't gotten the memo. As fueling targets have climbed — 60g of carbs an hour used to be aggressive, now athletes routinely push 90-120g — your gut is being asked to process a flood of sugar with a fraction of its normal blood flow. The lining gets stressed, its barrier weakens, and that heavy, distended feeling shows up an hour later and lingers.
This bundle pairs SwissRX Happy Tummy's daily repair-and-rebuild formula with Nella's long-term probiotic foundation, so your gut is covered on both timescales — the acute stress of race-day fueling, and the baseline resilience underneath it.
Built for Two Different Jobs
Happy Tummy is a daily preventative — it repairs and rebuilds your gut lining before high-carb fueling stresses it, rather than treating bloat after the fact. Nella works underneath it, quietly building your gut's long-term resilience over weeks.
Strains Built for Athletes, Not General Wellness
Bacillus coagulans is spore-forming, so it survives stomach acid and arrives intact — it's the strain most linked to reduced bloating and gas. Nella's Lactobacillus strains were decoded from elite athletes' gut microbiomes, built around the specific digestive demands of people who train hard for a living.
Covers Digestion, Sleep, and Energy
Together you get gut lining repair, less bloat, better nutrient absorption, improved sleep quality, and more consistent energy.
Happy Tummy works in layers: Slippery Elm and Marshmallow Root form a gel-like coating over irritated gut tissue, like a bandage over a scrape, while 3g of L-Glutamine refuels the intestinal cells that hard training drains fastest. On the rebuild side, 10 billion CFU across five strains — including Akkermansia muciniphila, the strain gut-health researchers are most excited about — repopulate the gut, fed by 3g of African Baobab prebiotic fiber. Nella's strains work on a slower timeline, rebuilding your gut's baseline over 4-8 weeks.
Happy Tummy: Take one stick daily, mixed with 8-12 oz of water, in the morning or post-workout — consistency matters more than timing it around a specific session.
Nella: Take one capsule daily.
Pro tip: Start both at least 4-8 weeks before a big race or training block — neither is a quick fix.
Endurance athletes managing aggressive fueling strategies and race-day nerves use this combo to stay comfortable and consistent, session after session.
Stop treating gut issues like bad luck. Give your microbiome a system, not a band-aid — and save 15% when you shop them together.
Always Happy Promise: Don't like a product? Tell us within 30 days of receipt and we'll make it right and make you happy. Here at The Feed, we want you to love your experience and the sports nutrition products you purchase. If, for any reason, you are not satisfied with your nutrition specific purchase, tell us.
We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
SwissRX Happy Tummy + Nella Performance Probiotic FAQ's
Everything you need to know about SwissRX Happy Tummy + Nella Performance Probiotic.
Happy Tummy is a daily preventative that repairs and rebuilds your gut lining before high-carb fueling stresses it. Nella works on a slower timeline, rebuilding your gut's baseline resilience over weeks.
Yes — both are daily. Happy Tummy handles the acute, day-to-day stress of high-carb fueling; Nella works underneath it, rebuilding your gut's resilience over weeks. Neither is meant to be used only when you're already uncomfortable.
Happy Tummy's gut-soothing ingredients and gut training benefits can show up within days to weeks as your gut adapts. Nella's benefits build gradually — most athletes need 4-8 weeks before noticing a difference in digestion, sleep, or energy, so start it well before your target race or training block.
Yes — that's exactly who this bundle is built for. Happy Tummy's Slippery Elm, Marshmallow Root, and L-Glutamine calm and protect your gut lining, while Nella's strains support overall digestive resilience.
Most probiotics use generic strains sourced from soil or food. Nella's Lactobacillus strains are decoded directly from the gut microbiomes of elite, high-performing athletes — built for the specific demands of people who train hard, not general wellness.