🟢 100/100

This product looks safe

  • No ingredients exceed tolerable upper intake levels
  • 56% of ingredients have research evidence
A Label Compliance Grade

Product Label

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Label Data

167 Gram(s) Serving Size
16 Servings
Other Combinations Product Type
56% Evidence Coverage

Supplement Facts — Evidence Check

Calories
640 Calorie(s)
Total Fat
8 Gram(s) (12% DV)
Cholesterol
60 mg (20% DV)
Total Carbohydrates
81 Gram(s) (27% DV)
Protein
54 Gram(s) (108% DV)
Vitamin A
4500 IU (90% DV)
Vitamin C
60 mg (100% DV)
240 IU (60% DV)
✅ Within RDA (0.4× RDA of 0.015 mg) 📚 604 studies (Tier A: 16, B: 251)
RDA 0.015mg This product: 0.006mg UL 0.1mg
45 IU (150% DV)
✅ 2.0× RDA — within safe limits 📚 177 studies (Tier A: 3, B: 90)
RDA 15mg This product: 30.150000000000002mg UL 1000mg
40 mcg (50% DV)
✅ Within RDA (0.3× RDA of 0.12 mg) 📚 273 studies (Tier A: 9, B: 175)
RDA 0.12mg This product: 0.04mg
0.9 mg (60% DV)
✅ Within RDA (0.8× RDA of 1.2 mg) 📚 76 studies (Tier A: 0, B: 33)
RDA 1.2mg This product: 0.9mg
1 mg (59% DV)
✅ Within RDA (0.8× RDA of 1.3 mg) 📚 12 studies (Tier A: 0, B: 1)
RDA 1.3mg This product: 1mg
20 mg (100% DV)
✅ 1.4× RDA — within safe limits 📚 193 studies (Tier A: 5, B: 63)
RDA 14mg This product: 20mg UL 35mg
1.2 mg (60% DV)
✅ Within RDA (0.9× RDA of 1.3 mg) 📚 113 studies (Tier A: 3, B: 35)
RDA 1.3mg This product: 1.2mg UL 100mg
400 mcg (100% DV)
✅ Within RDA (1.0× RDA of 0.4 mg) 📚 225 studies (Tier A: 10, B: 105)
RDA 0.4mg This product: 0.4mg UL 1.0mg
3 mcg (50% DV)
✅ 1.3× RDA — within safe limits 📚 138 studies (Tier A: 1, B: 44)
RDA 0.0024mg This product: 0.003mg
180 mcg (60% DV)
📊 6.0× RDA — above typical dose 📚 26 studies (Tier A: 0, B: 11)
RDA 0.03mg This product: 0.18mg
4 mg (40% DV)
✅ Within RDA (0.8× RDA of 5 mg) 📚 1 studies — no high-quality reviews
RDA 5mg This product: 4mg
Calcium
983 mg (98% DV)
Iron
14 mg (78% DV)
1050 mg (105% DV)
✅ 1.5× RDA — within safe limits 📚 12 studies (Tier A: 0, B: 3)
RDA 700mg This product: 1050mg UL 4000mg
66 mcg (44% DV)
✅ Within RDA (0.4× RDA of 0.15 mg) 📚 243 studies (Tier A: 4, B: 133)
RDA 0.15mg This product: 0.066mg UL 1.1mg
85 mg (21% DV)
📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)
This product: 85mg
8 mg (53% DV)
✅ Within RDA (0.7× RDA of 11 mg) 📚 258 studies (Tier A: 6, B: 134)
RDA 11mg This product: 8mg UL 40mg
28 mcg (40% DV)
✅ Within RDA (0.5× RDA of 0.055 mg) 📚 172 studies (Tier A: 0, B: 67)
RDA 0.055mg This product: 0.028mg UL 0.4mg
0.97 mg (49% DV)
✅ 1.1× RDA — within safe limits 📚 36 studies (Tier A: 0, B: 11)
RDA 0.9mg This product: 0.97mg UL 10mg
1.8 mg (90% DV)
✅ Within RDA (0.8× RDA of 2.3 mg) 📚 8 studies — no high-quality reviews
RDA 2.3mg This product: 1.8mg UL 11mg
55 mcg (46% DV)
✅ 1.6× RDA — within safe limits 📚 197 studies (Tier A: 1, B: 55)
RDA 0.035mg This product: 0.055mg
61 mcg (81% DV)
✅ 1.4× RDA — within safe limits 📚 2 studies — no high-quality reviews
RDA 0.045mg This product: 0.061mg UL 2mg
259 mg (8% DV)
📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)
This product: 259mg
Sodium
430 mg (18% DV)
Potassium
1760 mg (50% DV)
📊 Market median: 5.0mg (298 products) 📚 701 studies (Tier A: 5, B: 123)
This product: 3000mg
3000 mg
📊 Market median: 420.0mg (227 products)
Median 420.0mg This product: 3000mg

Other Ingredients

Energizing Carb Optimizer Blend Metamyosyn Muscle Mass Optimizer Blend Cocoa MultiVitamin Optimizer Blend Natural and Artificial flavors non-dairy Creamer Lean Lipid Optimizer Blend Cellulose Gum Xanthan Gum Guar Gum Carrageenan Sucralose Salt Sodium Citrate Acesulfame Potassium Gelatin

Label Claims — Verification

Nutrient
All Other
Structure/Function
All Other (98% of products) Structure/Function (93% of products) Nutrient (20% of products)

Target Groups

Adult (18 - 50 Years)

Product Information

📋 Directions for Use

For maximum results, take four (4) scoops with 16 oz. water immediately following your workout.

Use in conjunction with an intense daily exercise program and a balanced diet including an adequate caloric intake.

Directions: For adults, add four (4) scoops (640 calories) (167g) to 16 ounces of cold water and mix thoroughly in a blender or shaker. For increased calories, use 16 ounces of skim milk (806 total calories) or 2% milk (884 total calories) instead of water. Increase or decrease the amount of liquid to achieve desired consistency. Drink immediately for best results.

⚠️ Warnings & Precautions

Warning: Not intended for use by pregnant or nursing women. If you are taking any medications, planning any medical or surgical procedure or have any medical condition, consult your doctor before use.

Avoid this product if you have kidney disease. Discontinue use and consult your doctor if any adverse reactions occur.

Not intended for use by persons under the age of 18. Keep out of reach of children.

Tamper Resistant: Do not use if seal under cap is broken or missing.

Contains milk, egg and soy ingredients.

As a reminder, discuss the supplements and medications you take with your health care providers.

🧪 Formulation Notes

Providing 54g of protein and 640 calories per 4 scoop serving, Xtreme Size Up should be your only choice for serious mass gaining.

Metamyosyn Muscle Mass Optimizer Blend combines the trusted Metamyosyn protein blend, with extra Whey Protein and Creatine, to provide sustained, highly bioavailable fuel for your body’s protein needs.

Energizing Carb Optimizer Blend contains high fiber and glycogen-building carbs that work hand-in-hand with the Muscle Mass Optimizer Blend.* This specialized blend contains over 80g of carbs per serving to keep your muscles fully loaded with this important macronutrient.

MET-Rx Xtreme Size Up is formulated with no fructose, so you won't experience the dreaded crash and burn that comes from consuming sugar-laden formulas.

Lean Lipid Optimizer Blend contains just the right amount of dietary fats per serving.

54g protein Features Metamyosyn protein blend 640 calories 3g creatine

Contains milk, egg and soy ingredients.

Additional Information

New look Post-workout

Our specially selected nutrients are designed to meet your body's needs for both immediate and sustained energy and protein synthesis. The secret is the source of protein!

A combination of fast and slow proteins results in a more prolonged absorption rate allowing extended muscle-amino delivery.

Keep your mind and muscles energized with carbs so you can keep training and growing!

We know that your goal in your workout is to pack inches onto your biceps rather than your waist, so we didn't compromise quality with loads of fats that could slow down your progress. MultiVitamin Optimizer Blend is packed with specially selected vitamins and minerals essential to carbohydrate and protein metabolism. Optimal intake of key vitamins and minerals is especially important when following a high-calorie diet and exercise program for mass gains, in order to assure proper usage and muscle metabolism of ingested calories. You can rest assured that our comprehensive blend of the right vitamins and minerals will complement your nutrition plan to support your bodybuilding or fitness goals. In order to make serious gains, you need to train hard, get lots of rest, and take in plenty of key nutrients.

Store at room temperature and avoid excessive heat.

Contents are sold by weight. Some settling may occur.

Sports nutrition

Naturally and artificially flavored

Build muscle mass and strength Boost post-workout recovery Per 4 scoop serving

15828 11J B67095

Part No. 30-41086

Product Details

UPC / SKU 7 86560 15828 2
DSLD Entry Date 2017-05-24
Product Type Other Combinations
Form Powder
Brand MET-Rx
DSLD ID 74269
Data Updated 2026-04-11

Research Evidence

739 Research Sources
47 Avg Quality Score
472 Clinical Trial
139 Meta Analysis
74 Systematic Review
47 Rct
2 Regulatory Source
1 Cochrane Review
1 Guideline
1 Openfda Safety
A Association of Age, Antipsychotic Medication, and Symptom Severity in Schizophrenia With Proton Magnetic Resonance Spectroscopy Brain Glutamate Level: A Mega-analysis of Individual Participant-Level Data
Meta Analysis JAMA psychiatry 2021
A HMG CoA reductase inhibitors (statins) for people with chronic kidney disease not requiring dialysis
Meta Analysis The Cochrane database of systematic reviews 2014
A Cordyceps sinensis (a traditional Chinese medicine) for treating chronic kidney disease
Meta Analysis The Cochrane database of systematic reviews 2014
B Greater Choline-Containing Compounds and Myo-inositol in Treatment-Resistant Versus Responsive Schizophrenia: A 1H-Magnetic Resonance Spectroscopy Meta-analysis
Meta Analysis Biological psychiatry. Cognitive neuroscience and neuroimaging 2024
B Comparison of statins for secondary prevention in patients with ischemic stroke or transient ischemic attack: a systematic review and network meta-analysis
Systematic Review BMC medicine 2019
B Efficacy of Creatine Supplementation Combined with Resistance Training on Muscle Strength and Muscle Mass in Older Females: A Systematic Review and Meta-Analysis
Meta Analysis Nutrients 2021
B The Effects of Creatine Supplementation on Upper- and Lower-Body Strength and Power: A Systematic Review and Meta-Analysis
Meta Analysis Nutrients 2025
B Meta-analysis of the efficacy and safety of Finerenone in diabetic kidney disease
Meta Analysis Medicine 2026
B Creatine and creatine analogues in hypertension and cardiovascular disease
Meta Analysis The Cochrane database of systematic reviews 2011
B HMG CoA reductase inhibitors (statins) for dialysis patients
Meta Analysis The Cochrane database of systematic reviews 2013
View all evidence for Creatine →

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