Glutamine is the body's most abundant amino acid (Cruzat et al., 2018). It makes up ~60% of skeletal muscle amino acids. Body functions: Immune system support Gut health Muscle recovery Energy source for certain cells

Glutamine: Worth It or Waste of Money?

Q: What Does Science Actually Show?

Multiple studies in healthy athletes: No difference in muscle mass gains No difference in strength gains No difference in training performance Reason: The body produces enough glutamine itself and gets it from food. Some studies show slight reduction in muscle soreness Others show no difference Effect if any is very small Works: Ultra-endurance athletes (marathon runners, triathletes) After very intense training periods During or after illness Doesn't work: Regular strength trainers Moderate-intensity athletes

Q: When MIGHT Glutamine Help?

Ultra-marathoners, Ironman triathletes: Long-term intense training depletes glutamine stores May reduce risk of getting sick Dose: 5-10g daily during intense periods Leaky gut syndrome, IBD: Glutamine supports intestinal lining May help restore gut barrier Dose: 5-15g daily (under doctor supervision) Surgeries, serious infections: Body's glutamine needs increase May support recovery Used in hospitals as IV If not eating enough protein: Glutamine deficiency possible Better solution: eat more protein

What is Glutamine?

Glutamine is the body's most abundant amino acid (Cruzat et al., 2018). It makes up ~60% of skeletal muscle amino acids.

Body functions:

Immune system support
Gut health
Muscle recovery
Energy source for certain cells

Glutamine Promises

Supplement companies claim:

✓ Faster recovery
✓ Less muscle soreness
✓ More muscle mass
✓ Stronger immune system
✓ Better training results

But do studies support these claims?

What Does Science Actually Show?

For Muscle Mass and Strength: DISAPPOINTMENT

Multiple studies in healthy athletes:

No difference in muscle mass gains
No difference in strength gains
No difference in training performance

Reason: The body produces enough glutamine itself and gets it from food.

For Recovery: MIXED

Some studies show slight reduction in muscle soreness
Others show no difference
Effect if any is very small

For Immune System: CONDITIONAL YES

Works:

Ultra-endurance athletes (marathon runners, triathletes)
After very intense training periods
During or after illness

Doesn't work:

Regular strength trainers
Moderate-intensity athletes

Why Doesn't Glutamine Work for Healthy Athletes?

1. Body Produces Enough

The body synthesizes glutamine in muscle tissue. Healthy people don't have a deficiency.

2. Food Provides Enough

Food	Glutamine (per 100g)
Beef	1.2g
Chicken	1.1g
Fish	1.0g
Eggs	0.6g
Milk	0.3g

100g meat = ~1g glutamine

If you eat protein-rich food, you already get plenty of glutamine.

3. Most Is Broken Down in Gut

About ~65% of oral glutamine is used up by gut cells before it reaches muscles.

When MIGHT Glutamine Help?

1. Intense Endurance Sports

Ultra-marathoners, Ironman triathletes:

Long-term intense training depletes glutamine stores
May reduce risk of getting sick
Dose: 5-10g daily during intense periods

2. Gut Problems

Leaky gut syndrome, IBD:

Glutamine supports intestinal lining
May help restore gut barrier
Dose: 5-15g daily (under doctor supervision)

3. During or After Serious Illness

Surgeries, serious infections:

Body's glutamine needs increase
May support recovery
Used in hospitals as IV

4. Very Low Protein Intake

If not eating enough protein:

Glutamine deficiency possible
Better solution: eat more protein

Dosing (if you decide to use)

Goal	Dose
Immune system (intense training)	5-10g daily
Gut health	5-15g daily
General supplementation	3-5g daily

Timing: Not critical. Can split into multiple doses.

Better Use of Money

Instead of buying glutamine, spend on:

1. creatine supplements - proven effect on strength and muscle mass
2. protein powders - already contains glutamine + complete amino acids
3. vitamin D supplements - needed in northern climates
4. Magnesium - many people are deficient

Our Honest Assessment

Glutamine is one of the most overhyped supplements on the market.

Group	Recommendation
Regular strength trainer	❌ Don't buy
Endurance athlete (moderate)	❌ Probably not
Ultra-endurance athlete	✅ May consider
Gut problems	✅ Under doctor guidance
Vegans/vegetarians	⚠️ Possible benefit

Summary

Glutamine IS NOT a miracle supplement for building muscle.

Facts:

Healthy athletes don't need extra glutamine
Body produces and food provides enough
Studies don't support muscle mass/strength claims
Only helps in specific situations

Spend saved money elsewhere - on creatine, protein, vitamin D!

References

1. Gleeson M. (2008). Dosing and efficacy of glutamine supplementation in human exercise and sport training. Journal of Nutrition, 138(10), 2045S-2049S.
2. Cruzat V, Macedo Rogero M, Noel Keane K, Curi R, Newsholme P. (2018). Glutamine: metabolism and immune function, supplementation and clinical translation. Nutrients, 10(11), 1564.
3. Ramezani Ahmadi A, Rayyani E, Bahreini M, Mansoori A. (2019). The effect of glutamine supplementation on athletic performance, body composition, and immune function: a systematic review and meta-analysis of clinical trials. Clinical Nutrition, 38(3), 1076-1091.
4. Legault Z, Bagnall N, Bhondiker DS. (2015). The influence of oral L-glutamine supplementation on muscle strength recovery and soreness following eccentric exercise. International Journal of Sport Nutrition and Exercise Metabolism, 25(5), 417-426.

See also:

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