Benefits
Prebiotic gut support
In a meta-analysis of 50 randomized trials with 2,525 participants, chicory inulin-type fructans at 3 to 20 g/day increased gut bifidobacteria compared with control, in healthy people and in several patient groups but not in people with gastrointestinal disorders. Trials tested chicory inulin in general rather than Fibruline specifically.
Body weight and waist size
A meta-analysis of 32 randomized trials found chicory inulin-type fructans reduced body weight by about 1 kg more than placebo (0.97 kg), with smaller drops in BMI, fat mass and waist circumference. Results varied a lot between trials, two of the three authors work for a company that sells chicory fiber, and no trial singled out Fibruline.
Digestive regularity
In the same 50-trial meta-analysis, chicory inulin-type fructans improved bowel function measures in healthy people. In a 2-week tolerance trial of Fibruline, digestive symptoms rose only mildly, and significantly only at 20 g/day of Fibruline Instant.
Mechanism of action
Selective fermentation
Inulin resists digestion in the upper gut and is fermented in the colon, selectively nourishing beneficial bacteria and producing short-chain fatty acids.
Satiety signaling
Short-chain fatty acids from inulin fermentation are thought to influence gut hormones involved in fullness; this was not measured in the trials cited here.
Clinical trials
Systematic review, meta-analysis and meta-regression of randomized controlled trials (Reimer et al. 2024, Am J Clin Nutr)
Adults in 32 trials; 1,184 participants in the body weight analysis.
Body weight fell 0.97 kg more than placebo (95% CI 0.59 to 1.34), BMI 0.39 kg/m2, fat mass 0.37 kg and waist circumference 1.03 cm. Body weight results were highly heterogeneous (I2 73 percent). Dose, duration and fructan type did not clearly change the effect. Two authors are employees of BENEO, a chicory fructan producer.
Systematic review with meta-analyses of randomized controlled trials lasting at least 7 days (Nagy et al. 2023, Crit Rev Food Sci Nutr)
2,525 participants aged 0 to 83 years in 50 trials.
Chicory inulin-type fructans at 3 to 20 g/day increased Bifidobacterium abundance (standardized mean difference 0.83, 95% CI 0.58 to 1.08). Effects were seen in healthy people and in populations with health impairments except gastrointestinal disorders, and bowel function improved in healthy people.
Double-blind, placebo-controlled, randomized, cross-over, dose-ranging study with 2-week treatment periods (Bruhwyler et al. 2009, Int J Food Sci Nutr)
84 healthy volunteers aged 18 to 45.
Fibrulose F97 (5 and 20 g/day), Fibruline Instant (5, 10 and 20 g/day) and Fibruline XL (10 g/day) tended to increase digestive symptoms, but the change was mild and significant only for Fibruline Instant at 20 g/day. The authors judged all three well tolerated.