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Head-to-head evidence comparison — which supplement is right for you?
Bromelain vs L-Glutamine: L-Glutamine has the stronger overall evidence (6 vs 5.5/10); they're alternatives for speed up recovery — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
L-Glutamine wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
4 of 4 studies with measurable effects showed benefit.
Top outcomes
Verdict
Too few graded studies
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both Bromelain and L-Glutamine have evidence — compare verdict strength side-by-side.
500-1,000 mg a day. The cited trials used 1,000 mg a day. Label products go up to 2,000 mg, above that dose, and are often labelled by enzyme activity in GDU instead (2,000-3,000 GDU is a common label figure).
On empty stomach for systemic effects, With meals for digestive effects
Capsules standardized to GDU (gelatin digesting units)
5-10g (a typical label dose, not the dose used in the cited trials, which dosed by body weight at 0.3 to 0.6 g per kg a day)
Post-workout, Before bed, Or split throughout day
L-Glutamine powder
3-7 days
1-2 weeks
3-7 days
Ongoing
2-4 weeks
2-4 weeks
Exploring the Therapeutic Potential of Bromelain: Applications, Benefits, and Mechanisms
Nutrients (2024) · Systematic review
It has a long history of traditional medicinal use in various cultures, particularly in Central and South America, where pineapple is native.
Bromelain as a natural anti-inflammatory drug: a systematic review
Natural product research (2025) · Systematic review
Among these compounds, bromelain is highlighted, as a cysteine protease isolated from the Ananas comosus (pineapple) stem.
Bromelain and liver health: A comprehensive systematic review of preclinical studies
Clinical nutrition ESPEN (2025) · Systematic review
Systematic review of 7 preclinical studies of bromelain in liver injury, selected from 329 articles.
A Phase 3 Trial of l-Glutamine in Sickle Cell Disease
The New England journal of medicine (2018) · Rct · n=230
A total of 230 patients (age range, 5 to 58 years; 53.9% female) were randomly assigned, in a 2:1 ratio, to receive l-glutamine (152 patients) or placebo (78 patients).
What Is the Role of Nutritional Supplements in Support of Total Hip Replacement and Total Knee Replacement Surgeries? A Systematic Review
Nutrients (2018) · Systematic review
Amino acid supplementation is reported to reduce muscle atrophy and accelerate return of functional mobility.
Evidence and gaps in clinical outcomes of novel pharmacologic therapies for sickle cell disease: A systematic literature review highlighting insights from clinical trials and real-world studies
Blood reviews (2025) · Systematic review · n=97
A pivotal phase III study of l-glutamine showed that patients treated with l-glutamine had a 25 % reduction in pain crises and 33 % fewer hospital days compared to placebo. l-glutamine was generally well tolerated with minimal side effects.
L-Glutamine has a higher evidence score (6/10 vs 5.5/10) and wins in 3 of 3 categories.
For speed up recovery, L-Glutamine has a higher relevance score (65 vs 30).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.