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L-Glutamine 500 mg

Source Naturals

4.7
(525 ratings)
Glutamine 500 mg
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Score 25.0

This L-Glutamine product offers a minimal 500mg dose per tablet, falling far short of typical therapeutic recommendations for its intended goals and becoming cost-prohibitive for effective daily use compared to higher-dose powder options.

Quantity: 100 Tablet(s)Servings size: 1 Tablet(s) (100 servings)
Selected goals:
Other goals:
Fitness
Muscle Gain
Digestive Health
Immunity

Score 25.0

This L-Glutamine product offers a minimal 500mg dose per tablet, falling far short of typical therapeutic recommendations for its intended goals and becoming cost-prohibitive for effective daily use compared to higher-dose powder options.

Analysis

This Source Naturals L-Glutamine product provides a low dose of 500 mg per tablet, which is significantly below the generally recognized therapeutic dose of 5-10 grams (5000-10000 mg) often recommended by nutritionists and online communities for its stated goals of immunity, fitness, muscle gain, and digestive health. While the price per 500mg serving appears low at $0.09, achieving an effective daily dose would require taking 10-20 tablets, making it highly inconvenient and very expensive compared to powdered L-Glutamine alternatives. The tablet form also may not offer the same rapid absorption as micronized powders, further diminishing its appeal for therapeutic use.
Pros
  • Very low price per individual 500mg serving, making it accessible for micro-dosing
  • Convenient tablet form for small, occasional doses or for those who prefer pills over powder
Cons
  • Extremely low dose per serving (500mg) for most therapeutic applications, requiring many tablets daily
  • High cost to achieve an effective daily dose (e.g., 5g) compared to bulk L-Glutamine powders
  • Tablet form may have slower dissolution and potentially less bioavailability than micronized powder
Warnings
  • Users seeking significant benefits for immunity, fitness, muscle gain, or digestive health should be aware that the 500mg dose is likely insufficient and would require multiple servings daily, incurring substantial cost.
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$9.22($0.09 per serving)
iHerb
$ 9.22
Amazon
$ 12.03
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Effectiveness for goals

Dosage, timing & forms

Safety & interactions

Ingredients

IngredientAmount per serving
L-Glutamine
500 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free Vegetarian
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Categories

As a pure L-Glutamine product, it meets the basic collection requirement, but the very low dosage per serving makes it a less practical and cost-effective option compared to other Glutamine supplements offering higher, more therapeutically relevant doses.

Goals

While L-Glutamine supports immune cell function, the 500mg dose is substantially lower than amounts typically shown to provide significant immune boosting benefits, making it less effective than higher-dose alternatives.
For fitness and recovery, L-Glutamine doses of 5g or more are usually recommended to impact performance or reduce muscle soreness; this 500mg dose is largely insufficient for noticeable effects.
L-Glutamine is a vital fuel source for intestinal cells and helps maintain gut barrier integrity, but 500mg is unlikely to provide substantial benefits for digestive issues or gut healing where higher doses (5g+) are typically used.
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Micronized L-Glutamine 1000 mg

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Provides double the dose (1000mg) in a micronized form, which may improve absorption, for a very reasonable increase in price per serving compared to the original 500mg capsule.
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Glutamine Pure Powder 5000 mg (5 g)

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Goes beyond pure L-Glutamine by including 2500mg of L-Glutamine along with BCAAs and electrolytes, making it a superior choice for muscle gain, recovery, and hydration, directly addressing fitness goals.
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L-Glutamine 500 mg

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4.7
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A slightly cheaper alternative from the same reputable brand, offering the familiar dosage and form.
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4.7
(5640 ratings)
Offers double the L-Glutamine (1000mg) per serving for a comparable price per serving as the original, providing excellent value per milligram.
89 Value

Micronized L-Glutamine 1000 mg

Natural Factors
4.8
(1738 ratings)
Provides double the dose (1000mg) in a micronized form, which may improve absorption, for a very reasonable increase in price per serving compared to the original 500mg capsule.
80 Value

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Jarrow Formulas
4.7
(1536 ratings)
Offers a 750mg dose of L-Glutamine per serving, representing a 50% increase in dosage for only a slightly higher price per serving, enhancing its overall value.
98 Performance

Glutamine 300

PS ProSupps
4.6
(629 ratings)
Delivers a substantially higher dose (4500mg) of L-Glutamine in a flexible powder form, which nutritionists often recommend for higher therapeutic doses and faster absorption for fitness goals.
95 Performance

Glutamine Pure Powder 5000 mg (5 g)

Country Life
4.8
(704 ratings)
Provides an even higher 5000mg dose of pure L-Glutamine powder, offering maximum potency and flexibility in dosing for intensive needs like muscle recovery or digestive support.
92 Performance

The Original Watermelon Explosion

XTEND
4.5
(46842 ratings)
Goes beyond pure L-Glutamine by including 2500mg of L-Glutamine along with BCAAs and electrolytes, making it a superior choice for muscle gain, recovery, and hydration, directly addressing fitness goals.
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