Fecal lactoferrin measurement is used clinically to distinguish IBS (non-inflammatory; fecal lactoferrin normal) from IBD (inflammatory; fecal lactoferrin elevated). For IBS patients (with normal fecal lactoferrin indicating no significant mucosal inflammation), supplemental lactoferrin addresses the gut barrier dysfunction and microbiome dysbiosis that contribute to IBS symptoms without requiring anti-inflammatory pharmaceutical intervention.

Should I test fecal lactoferrin before starting supplemental lactoferrin?

Not specifically required. Fecal lactoferrin testing helps determine if you have IBD (which requires different management) vs IBS. If you have clear IBS diagnosis, supplemental lactoferrin can be started without prior fecal lactoferrin testing.

Does lactoferrin worsen IBS symptoms initially?

Some users report transient increased bloating in the first 1–2 weeks as the microbiome composition shifts (Bifidobacterium enrichment produces gas during adaptation). This typically resolves within 2 weeks.