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GI Sustain

Metagenics
4.8
★ ★ ★ ★ ★
(13 ratings)
Glutamine 500 mg
Glycine 100 mg
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Score68
A broad fortified nutrition powder offers protein and prebiotic support, but low glutamine depth, high cost, and nutrient overlap limit general use.
How scoring works
Quantity:1 Pound(s) • (14 servings)
Goals:

Score 68

A broad fortified nutrition powder offers protein and prebiotic support, but low glutamine depth, high cost, and nutrient overlap limit general use.
How scoring works
$96.95($6.92 per serving)
iHerb
$ 96.95
Pure Formulas
$ 96.95
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Analysis

Thirteen grams of protein, prebiotic isomaltooligosaccharides, minerals, and vitamins provide more complete nutrition than a simple amino powder. Glutamine, glycine, methionine, lysine, threonine, and cysteine add a small amino-support layer.

The 500 mg glutamine amount is modest despite the large 170-calorie serving. Extensive fortification includes retinyl vitamin A, iron, chromium, and a high pantothenic-acid amount, making overlap with other supplements important.

The very high serving cost and short 14-serving supply limit routine value. It may fit a clinician-directed nutrition plan, but it is inefficient for isolated gut-barrier or glutamine support.

Who is it for
  • Adults using a clinician-directed nutrition plan
  • People seeking protein with prebiotic carbohydrate
  • Users who need a broad fortified powder
Best for
  • Short-term meal-support routines
  • Combining protein, fiber, and micronutrients
  • People who need more than glutamine alone

Pros

  • Moderate protein amount
  • Includes prebiotic carbohydrate
  • Broad vitamin and mineral coverage

Cons

  • Only 500 mg glutamine
  • Very high serving cost
  • Short 14-serving supply

Warnings

  • The formula contains preformed vitamin A, so pregnant users should review total retinol intake with their clinician.
  • Iron is included and may be inappropriate for people with iron-overload disorders or those told to avoid supplemental iron.
  • The serving supplies 24 g carbohydrate, which may matter for people managing blood glucose or carbohydrate intake.

Nutrient quality

78 High impact

Protein, fiber, activated vitamins, and citrate minerals provide broad nutritional support. Low targeted amino acids and a relatively aggressive micronutrient profile reduce balance.

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Ingredient transparency

76 High impact

Most amounts are disclosed without a hidden blend. Duplicate nutrient entries, absent intake directions, and missing flavor or processing ingredients reduce clarity.

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Customer satisfaction

58 Moderate impact

The supplied average rating is strong and comes from a minimal rating pool. No firsthand experiences or recurring complaint details were provided, so consistency remains uncertain.

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Value for money

55 Moderate impact

Broad nutrition provides some formula value, but the serving cost is very high. Low glutamine and glycine amounts make it poorly competitive for targeted amino-acid use.

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Ingredients

IngredientAmount per serving
Calories
170 Calorie(s)
Total Fat
5 Gram(s)
Total Carbohydrates
24 Gram(s)
Protein
13 Gram(s)
Vitamin A (Beta-Carotene, Retinyl Palmitate)
 1200 mcg
Vitamin C (Ascorbic Acid)
 102 mg
Vitamin D (Cholecalciferol)
 1.2 mcg
Vitamin E (D-Alpha-Tocopheryl Acetate)
 33.5 mg
Thiamine (Thiamine Hydrochloride)
 0.5 mg
Riboflavin
0.6 mg
Niacin (Niacinamide)
 10 mg
Vitamin B6 (Pyridoxine Hydrochloride)
 0.7 mg
Folate (Calcium L-5-Methyltetrahydrofolate)
 235 mcg DFE
Vitamin B12 (Methylcobalamin)
 2.1 mcg
Biotin
105 mcg
Pantothenic Acid (Calcium D-Pantothenate)
 100 mg
Calcium (Calcium Citrate, Dicalcium Phosphate)
 300 mg
Iron (Ferrous Fumarate)
 3.6 mg
Phosphorus (Dicalcium Phosphate, Dipotassium Phosphate)
 180 mg
Magnesium (Magnesium Citrate)
 120 mg
Zinc (Zinc Gluconate)
 7.5 mg
Copper (Copper Gluconate)
 0.5 mg
Manganese
1.3 mg
Chromium (Chromium Picolinate)
 75 mcg
Sodium
20 mg
Potassium (Dipotassium Phosphate)
 300 mg
Isomaltooligosaccharides
3.4 Gram(s)
L-Glutamine
500 mg
Glycine
100 mg
DL-Methionine
100 mg
L-Lysine (L-Lysine Hydrochloride)
 35 mg
L-Threonine
34 mg
L-Cysteine (L-Cysteine Hydrochloride)
 25 mg
Gluten Free Adults 18–50
Report overview
Glutamine · 500 mg OverallScore64
C Active Ingredient Quality & BioavailabilityC- Dose, Safety & Label TransparencyB Value

Standard L-glutamine is clearly stated, but no premium grade or micronization claim is included. The 500 mg amount is low for targeted gut support despite the convenient powder format. Prebiotic fiber, protein, amino acids, and micronutrients support the value of the broader nutrition formula.

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Glycine · 100 mg OverallScore54
F Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyB- Value

The glycine amount is very low within a bulky nutritional powder. Exact disclosure is helpful, but the format and dose are poorly suited to targeted glycine use, and no premium source is stated. Protein, fiber, vitamins, and minerals support neutral full-formula value despite extremely weak glycine efficiency.

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Loading alternative details
80 Performance

Theracurmin & L-Glutamine

Natural Factors CurcuminRich
The more focused or more substantial active profile improves on a costly gastrointestinal nutrition powder with modest glutamine and glycine for the candidate's stated use. Substantial micronized glutamine and enhanced-delivery curcumin create a concise gut-barrier and inflammatory-balance formula, but active curcuminoid yield is not supplied.
71 Performance

IntestiNew

Renew Life
The more focused or more substantial active profile improves on a costly gastrointestinal nutrition powder with modest glutamine and glycine for the candidate's stated use. A substantial glutamine serving forms a strong intestinal-support base with N-acetyl glucosamine, although an undisclosed herbal blend and unclear glucosamine sourcing reduce transparency.
85 Performance

Glycine Powder

Metabolic Maintenance
The more focused or more substantial active profile improves on a costly gastrointestinal nutrition powder with modest glutamine and glycine for the candidate's stated use. The single-ingredient powder is easy to assess and scale toward a multi-gram glycine intake, though no premium purity grade is stated.
84 Budget

L-Glutamine Pure Powder

Best Naturals
It lowers recurring cost compared with a costly gastrointestinal nutrition powder with modest glutamine and glycine while retaining a relevant amino-acid pathway. The scalable single-ingredient powder provides a substantial glutamine serving with simple active disclosure.
84 Budget

Glutamine Pure Powder 5000 mg (5 g)

Country Life
It lowers recurring cost compared with a costly gastrointestinal nutrition powder with modest glutamine and glycine while retaining a relevant amino-acid pathway. A full five-gram L-glutamine serving provides far stronger targeted dose depth than a mixed formula, although no premium purity or micronized claim is supplied.
82 Budget

L-Glutamine Powder

Bluebonnet
It lowers recurring cost compared with a costly gastrointestinal nutrition powder with modest glutamine and glycine while retaining a relevant amino-acid pathway. A substantial pure glutamine powder serving offers practical targeted use without the pill burden of a multi-capsule blend.
84 Value

Glutamine 300

PS ProSupps
Stronger active focus at no higher supplied serving cost improves value relative to a costly gastrointestinal nutrition powder with modest glutamine and glycine. A nearly full targeted glutamine serving gives the simple powder strong dose convenience, though no premium purity or micronized-processing claim is stated.
82 Value

Pharmaceutical Grade AjiPure L-Glutamine 500 mg

Swanson Ultra
Stronger active focus at no higher supplied serving cost improves value relative to a costly gastrointestinal nutrition powder with modest glutamine and glycine. AjiPure and pharmaceutical-grade labeling strengthen raw-material confidence, though the modest capsule amount requires several capsules for targeted use.
83 Value

Pharmaceutical Grade AjiPure Glycine 500 mg

Swanson Ultra
Stronger active focus at no higher supplied serving cost improves value relative to a costly gastrointestinal nutrition powder with modest glutamine and glycine. Branded pharmaceutical-grade glycine provides strong source-quality disclosure, but the half-gram capsule remains modest for multi-gram use.
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