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L-Glutamine 500 mg

Source Naturals
4.7
(525 ratings)
Glutamine 500 mg
Product Image
Score 35.0

A 500mg L-Glutamine tablet from Source Naturals that is significantly underdosed, making it impractical and costly to use for effective support in immunity, fitness, muscle gain, or digestive health.

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

Score 35.0

A 500mg L-Glutamine tablet from Source Naturals that is significantly underdosed, making it impractical and costly to use for effective support in immunity, fitness, muscle gain, or digestive health.

Analysis

This L-Glutamine product from Source Naturals provides 500 mg per tablet. For goals such as muscle gain, immunity, or digestive health, nutritionists and general research recommend daily dosages ranging from 5 to 20 grams. Therefore, consuming 10 to 40 tablets daily would be necessary to achieve a therapeutically effective dose, rendering this product highly impractical and expensive despite its low price per serving. Online reviews and expert opinions frequently emphasize the need for significantly higher glutamine doses to experience tangible benefits in these areas.

Pros
  • Source Naturals is a reputable and established brand in the supplement industry, which generally indicates adherence to quality control standards.
  • The low price per serving ($0.10) makes the initial purchase very affordable, appealing to budget-conscious consumers.
Cons
  • The 500mg dosage per serving is substantially lower than clinically effective amounts (typically 5-20g daily) for immunity, muscle gain, and digestive health, rendering it largely ineffective for its stated goals.
  • To achieve a therapeutic daily dose, consumers would need to take an impractical number of tablets, which significantly increases the actual daily cost and inconvenience, making it inefficient.
Warnings
  • Consumers are unlikely to experience the desired benefits for immunity, muscle gain, or digestive health due to the significantly underdosed nature of each serving, which may lead to dissatisfaction and perceived lack of efficacy.
$9.22($0.09 per serving)
Amazon
$ 12.03
iHerb
$ 9.22
Ingredients
IngredientAmount per serving
L-Glutamine 500 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free Vegetarian
Categories
Glutamine 35.0
While categorized as a Glutamine product, its extremely low dosage per serving makes it uncompetitive and inefficient compared to alternative glutamine supplements, particularly powdered forms, that offer more practical and effective doses.
Goals
Immunity 30.0
For effective immune support, especially during periods of high stress or intense exercise, L-Glutamine is typically recommended in multi-gram doses, rendering 500mg per serving largely symbolic.
Fitness 30.0
Benefits for muscle recovery, reduced soreness, and improved performance from L-Glutamine usually require doses of 5 grams or more post-workout, making 500mg per serving insufficient for noticeable athletic improvements.
Muscle Gain 30.0
L-Glutamine's role in supporting muscle protein synthesis and reducing catabolism is more pronounced at much higher daily intake levels than 500mg, thus having minimal impact on muscle gain or preservation.
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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.