This study aims to evaluate the effect of four high-activity compound probiotic freeze-dried powders on improving gastrointestinal function, observing their regulatory effects on the gut microbiota and the incidence of adverse reactions in study participants over a 4-week intervention period.

Inclusion Criteria:

1. Voluntarily, in writing, sign the informed consent form, agreeing to participate in this study
2. Able to complete the study according to the requirements of the trial protocol
3. Age between 18 and 65 years old
4. Meet the diagnostic criteria for gastrointestinal dysfunction established in the "Chinese Precision Health Communication Expert Consensus on Citizen's Guide to Gastrointestinal Health"
5. Symptoms: Irregular bowel movements, loose or hard stools, abdominal bloating, belching, flatulence, severe intestinal gas, abdominal pain, acid reflux, heartburn, pain in the stomach or abdomen when hungry, nausea
6. Signs: Abdominal pain and bloating, diarrhea and constipation, indigestion, gastric acid reflux, bad breath and foul-smelling flatulence, skin problems, changes in stool color and shape -

Exclusion Criteria:

1. Use of drugs affecting the intestinal flora (including antimicrobials, probiotics, intestinal mucosal protective agents, traditional Chinese patent medicines, etc.) for more than 1 week continuously within 1 month prior to screening
2. Short-term consumption of products similar to the test substance, which affects the judgment of the results
3. Use of antibiotics during illness
4. Participants with severe systemic diseases or malignant tumors
5. Participants allergic to any components of the compound probiotic freeze-dried powder used in this trial
6. Women who are pregnant or breastfeeding, or those who have plans to conceive in the near future
7. Participants who cannot participate in the trial due to personal reasons
8. Other participants deemed unsuitable for participation by the researcher -