SNAC in Ozempic and Wegovy pills linked to gut changes
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- Adelaide University researchers observed in a 21-day animal model that repeated SNAC exposure was associated with a decline in fibre-breaking gut bacteria, lower short-chain fatty acids, increased blood inflammatory markers, greater liver weight, a smaller cecum, and reduced levels of a brain-derived protein associated with cognitive impairment.
- SNAC (salcaprozate sodium) shields semaglutide from stomach enzymes and enables it to enter the bloodstream; without it, oral Ozempic and Wegovy tablets would not work.
- Lead author Amin Ariaee, a PhD candidate at Adelaide University, said the rapid expansion of oral obesity treatments using SNAC makes it important to understand how every ingredient in the pill affects the body over time, not just the active drug.
- Senior Research Fellow Dr. Paul Joyce emphasized the findings are from animal research and do not prove SNAC causes harm in humans, but said the absorption enhancer may have adverse biological effects beyond drug delivery.
- The United States approved a tablet version of Wegovy late last year, and the researchers note that daily SNAC exposure is likely to rise significantly as more patients choose oral options over injections.
- The study, published in the Journal of Controlled Release, is the first in vivo investigation to systematically assess how repeated SNAC exposure affects gut microbiota, metabolic function, and related health markers.
- Global obesity figures cited: roughly 890 million adults and 160 million children affected worldwide; the US has the highest OECD rate at 43%, with Australia sixth at 31% and the OECD average at 25%.
Why it matters: Now that the US has approved a Wegovy pill, daily SNAC exposure grows with oral semaglutide adoption — and animal data already links SNAC to gut bacteria disruption, inflammation, and a depleted brain-linked protein. The researchers want safety evaluation of all pill components, not just semaglutide.
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