PlainPill

Fiber vs L-Glutamine for digestion

Short answer: For digestion, more users report improvement with L-Glutamine — 91% of 22 reports, versus 81% of 26 for Fiber.

Fiber has 1,399 meta-analyses and 3,260 randomized trials on PubMed; L-Glutamine has 19 and 117.

Based on 56 reports about Fiber and 88 about L-Glutamine. Not medical advice.

Fiber
Supplement
L-Glutamine
Supplement
User score4138
Verdict
Mostly positive
Mostly positive
Positive
of reports that state an outcome
69%64%
Reports5688
ResearchAResearch: StrongAResearch: Strong
Meta-analyses / RCTs1,399 / 3,26019 / 117
Mainly used for
Weight loss
% reporting improvement
100% (3)—
Appetite
% reporting improvement
100% (4)—
Focus
% reporting improvement
—100% (2)
Energy
% reporting improvement
—75% (4)
Sleep
% reporting improvement
100% (2)50% (2)
Anxiety
% reporting improvement
—60% (10)
Mood
% reporting improvement
—89% (9)
Performance
% reporting improvement
—50% (2)
Recovery
% reporting improvement
—80% (5)
Digestion
% reporting improvement
81% (26)91% (22)
Libido
% reporting improvement
—100% (2)
Common side effectscan exacerbateanxiety, stomach issues, weird feeling, glutamate spikes
Typical dose reported6 days/week5 g
Fiber
Latest review conclusion

Fiber supplementation is effective at improving constipation. Particularly, psyllium, doses >10 g/d and treatment durations of at least 4 weeks appear optimal, though caution is needed when interpreting the results due to considerable heterogeneity. These findings provide promising evidence on the optimal type and regime of fiber supplementation, which could be used to standardize recommendations to patients. The protocol for this review is registered at PROSPERO as CRD42020191404.

Am J Clin Nutr, 2022 ↗
What a user said
“I truly feel much less stressed in traffic/at work, etc. I cannot believe how little fiber my family has, and therefore I grew up having.”
Full Fiber profile →
L-Glutamine
Latest review conclusion

Dentoxol mouthwashes, Plantago major extract, thyme honey extract, zinc oxide paste, vitamin B complex combined with GeneTime, and the consumption of L-glutamine are effective in diminishing the severity of OM. Pain intensity was lower with doxepin mouthwashes and diphenhydramine-lidocaine-antacid mouthwashes.

Acta Odontol Latinoam, 2023 ↗
What a user said
“I tried out L-glutamine. It worked! I saw some real results taking 15g a day.”
Full L-Glutamine profile →

Related comparisons

Percentages come from first-hand user reports and are not clinical outcomes. Talk to a doctor before starting, stopping or combining anything. How we rate