🟢 99/100

This product looks safe

  • Copper: 1000mg is 100.0× the Tolerable Upper Intake Level (10mg)
  • 33% of ingredients have research evidence
C Label Compliance Grade

Product Label

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Safety Alerts

⚠️ Copper: 1000mg is 100.0× the Tolerable Upper Intake Level (10mg)

Label Data

61 Gram(s) Serving Size
14 Servings
Other Combinations Product Type
33% Evidence Coverage

Supplement Facts — Evidence Check

Calories
200 {Calories}
Calories from Fat
10 {Calories}
Total Fat
1 g (2% DV)
Saturated Fat
0.5 g (3% DV)
Cholesterol
25 mg (8% DV)
Total Carbohydrates
38 g (13% DV)
Sugar
13 g
Protein
10 g
0.75 mg (50% DV)
✅ Within RDA (0.6× RDA of 1.2 mg) 📚 76 studies (Tier A: 0, B: 33)
RDA 1.2mg This product: 0.75mg
0.6 mg (35% DV)
✅ Within RDA (0.5× RDA of 1.3 mg) 📚 12 studies (Tier A: 0, B: 1)
RDA 1.3mg This product: 0.6mg
7.5 mg (38% DV)
✅ Within RDA (0.5× RDA of 14 mg) 📚 193 studies (Tier A: 5, B: 63)
RDA 14mg This product: 7.5mg UL 35mg
1 mg (50% DV)
✅ Within RDA (0.8× RDA of 1.3 mg) 📚 113 studies (Tier A: 3, B: 35)
RDA 1.3mg This product: 1mg UL 100mg
200 mcg (50% DV)
✅ Within RDA (0.5× RDA of 0.4 mg) 📚 225 studies (Tier A: 10, B: 105)
RDA 0.4mg This product: 0.2mg UL 1.0mg
1 mcg (17% DV)
✅ Within RDA (0.4× RDA of 0.0024 mg) 📚 138 studies (Tier A: 1, B: 44)
RDA 0.0024mg This product: 0.001mg
25 mcg (8% DV)
✅ Within RDA (0.8× RDA of 0.03 mg) 📚 26 studies (Tier A: 0, B: 11)
RDA 0.03mg This product: 0.025mg
3.5 mg (35% DV)
✅ Within RDA (0.7× RDA of 5 mg) 📚 1 studies — no high-quality reviews
RDA 5mg This product: 3.5mg
Calcium
100 mg (10% DV)
250 mg (25% DV)
✅ Within RDA (0.4× RDA of 700 mg) 📚 12 studies (Tier A: 0, B: 3)
RDA 700mg This product: 250mg UL 4000mg
150 mg (38% DV)
📊 Market median: 4002.0mg (1 products) 📚 20 studies (Tier A: 0, B: 2)
This product: 150mg
7 mg (47% DV)
✅ Within RDA (0.6× RDA of 11 mg) 📚 258 studies (Tier A: 6, B: 134)
RDA 11mg This product: 7mg UL 40mg
25 mcg (36% DV)
✅ Within RDA (0.5× RDA of 0.055 mg) 📚 172 studies (Tier A: 0, B: 67)
RDA 0.055mg This product: 0.025mg UL 0.4mg
1 g (50% DV)
⚠️ Exceeds Tolerable Upper Intake Level by 100.0× (UL: 10 mg) 📚 36 studies (Tier A: 0, B: 11)
RDA 0.9mg This product: 1000mg UL 10mg
1.5 mg (75% DV)
✅ Within RDA (0.7× RDA of 2.3 mg) 📚 8 studies — no high-quality reviews
RDA 2.3mg This product: 1.5mg UL 11mg
Sodium
200 mg (8% DV)
Potassium
90 mg (3% DV)
D-Ribose
1.1 g
400 mg
📊 Market median: 500.0mg (159 products)
Median 500.0mg This product: 400mg
400 mg
📊 Market median: 500.0mg (193 products) 📚 7 studies — no high-quality reviews
This product: 400mg
L-Phenylalanine
350 mg
250 mg
📊 Market median: 17.4mg (161 products)
Median 17.4mg This product: 250mg
250 mg
📊 Market median: 420.0mg (227 products)
Median 420.0mg This product: 250mg
200 mg
📊 Market median: 500.0mg (143 products)
This product: 200mg
L-Histidine
200 mg
125 mg
📊 Market median: 17.4mg (161 products)
Median 17.4mg This product: 125mg
L-Aspartate
100 mg
L-Valine
50 mg

Other Ingredients

Maltodextrin Protein Blend Dextrose Fructose Vitamin/Mineral Premix Citric Acid Natural & Artificial flavors Malic Acid Lecithin Sucralose FD&C Yellow #5 & #6

Label Claims — Verification

All Other
Structure/Function
All Other (96% of products) Structure/Function (80% of products) Nutrient (60% of products) Approved Health (1% of products)

Target Groups

Adult (18 - 50 Years)

Product Information

📋 Directions for Use

DIRECTIONS: As a dietary supplement, add one level scoop (61 g) with 12-14 fl. oz. cold water. Take twice daily, once before workout and once during workout.

⚠️ Warnings & Precautions

KEEP OUT OF REACH OF CHILDREN.

CONTAINS: Milk and Soybeans.

🧪 Formulation Notes

ORANGE Natural + artificial flavors

Additional Information

Store in a cool, dry place.

^In a randomized, double blind, crossover study of 12 subjects involving 90 minutes of continuous cycling immediately followed by high intensity cycling at 85% VO2Max, consumption of two servings of the endurance formula present in this product during exercise resulted in improved time to exhaustion (4.57 minutes on active vs. 2.57 minutes on placebo) during the high-intensity cycling bout, reflecting an approximate 78% improvement in endurance performance.

• Clinically Shown to Improve Endurance Performance by 78% During Workout^ • Maximize Energy During High Intensity Exercise^ • Loaded with Electrolytes, Carbohydrates, BCAA & Hydrolysates to Rapidly Replenish Glycogen Stores*

ADVANCED MUSCLE PERFORMANCE

Aerobic competition accelerator

AMPLIFIED ENDURANCE BOOSTER IMPROVED ENDURANCE PERFORMANCE BY 2 MINUTES OR 78%!^ (chart) Time to Exhaustion (min) 0 5 AMPLIFIED ENDURANCE BOOSTER PLACEBO

Clinically Researched

CODE 386069 JLG

NOTICE: Significant product settling may occur.

Pre-Workout During Endurance Energy

The Proof is in the Results! In a clinical study, participants using Amplified Endurance Booster were able to exercise two minutes longer!^ This revolutionary product has been clinically proven to: • Improve Endurance Performance^ • Improve Cycling Time During a Time to Exhaustion During a Time Trial^ • Make High Intensity Endurance Exercise Easier^

What is Amplified Endurance Booster? Need an endurance boost? Go the distance and improve your time with Amplified Endurance Booster! It’s GNC’s most effective endurance product ever! This clinically studied formula is proven to improve endurance performance by 78% and make intense endurance exercise easier!*^ This unique formulation combines the nutrients your body needs the most during endurance exercise to go the extra mile. Key features include… Specialized Carbohydrate Blend – During intense long distance exercise, adequate amounts of quality carbohydrates must be available to energize your working muscles for the long haul. This formula contains two fast-acting carbs, dextrose and ribose, with a slower acting carbohydrate, maltodextrin, to provide sustained energy and blood sugar levels needed for maximum endurance performance.* 10 grams of Muscle Fueling Protein – While most sports drinks are made up simply of carbohydrates, studies show that a combination of carbs and protein during exercise can improve performance and better fuel your muscles for endurance exercise. That’s why this formula is packed with 10 grams of high quality protein to better fuel your game. Critical Amino Acids – Without a full amino acid pool, endurance performance can suffer. This product features Branched Chain Amino Acids (BCAA) to help preserve muscle glycogen stores and reduce protein breakdown during long distance activity.* It also includes glutamine, which plays an important role in muscle function and hydrating muscle cells.* 5-Electrolyte Blend – This thirst-quenching, hydration enhancer provides a 5-electrolyte blend, all of which are lost through sweat during exercise. Replacing lost electrolytes is necessary to help regulate body fluids. Not getting the right amounts of fluid, electrolytes, and other minerals present in this top notch formula may lead to muscle cramping. Vitamins and Minerals – Equipped with B-vitamins, this formula also supports carbohydrate metabolism and energy production.* Plus, it’s enhanced with calcium, which plays an important role in muscle contractions, and magnesium, which is necessary for muscle function.*

WHEN TO TAKE AMPLIFIED ENDURANCE BOOSTER (chart) 30 60 90 PREWORKOUT DURING POSTWORKOUT AMPLIFIED ENDURANCE BOOSTER For maximum results, take 30 minutes before and during long-distance exercise.

Product Details

UPC / SKU 0 48107 10005 6
DSLD Entry Date 2012-02-23
Product Type Other Combinations
Form Powder
DSLD ID 5864
Data Updated 2026-04-11

Research Evidence

2 Research Sources
34 Avg Quality Score
1 Rct
D Effect of pantothenic acid and ascorbic acid supplementation on human skin wound healing process. A double-blind, prospective and randomized trial
Rct European surgical research. Europaische chirurgische Forschung. Recherches chirurgicales europeennes 1995
D Pantothenic Acid
View all evidence for Pantothenic Acid →

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