🟢 97/100

This product looks safe

  • Niacin: 60mg is 1.7× the Tolerable Upper Intake Level (35mg)
  • 46% of ingredients have research evidence
C Label Compliance Grade

Product Label

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Safety Alerts

⚠️ Niacin: 60mg is 1.7× the Tolerable Upper Intake Level (35mg)

Label Data

9 Gram(s) Serving Size
30 Servings
Other Combinations Product Type
46% Evidence Coverage

Supplement Facts — Evidence Check

Calories
5 Calorie(s)
Total Carbohydrates
1 Gram(s) (1% DV)
Vitamin C
250 mg (417% DV)
60 mg (300% DV)
⚠️ Exceeds Tolerable Upper Intake Level by 1.7× (UL: 35 mg) 📚 193 studies (Tier A: 5, B: 63)
RDA 14mg This product: 60mg 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
500 mcg (125% DV)
✅ 1.2× RDA — within safe limits 📚 225 studies (Tier A: 10, B: 105)
RDA 0.4mg This product: 0.5mg UL 1.0mg
70 mcg (1167% DV)
📊 29.2× RDA — above typical dose 📚 138 studies (Tier A: 1, B: 44)
RDA 0.0024mg This product: 0.07mg
CarnoSyn
3.2 Gram(s)
1 Gram(s)
📊 Market median: 5.0mg (298 products) 📚 701 studies (Tier A: 5, B: 123)
This product: 1mg
📊 Market median: 500.0mg (143 products)
This product: 1mg
C4 Extreme Energy Blend
831 mg

Other Ingredients

Natural & Artificial flavors Citric Acid Malic Acid Silicon Dioxide Acesulfame Potassium Sucralose FD&C Red #40

Label Claims — Verification

All Other
Structure/Function
All Other (99% of products) Structure/Function (83% of products) Nutrient (54% of products)

Target Groups

Adult (18 - 50 Years)

Product Information

📋 Directions for Use

Suggested Use: Take one serving (1 scoop) of C4 Extreme Energy, mixed with 6-8 fl. oz. of water 20-30 minutes before training. During your workout, it is recommended that you drink plenty of water or performance beverage such as Cellucor Alpha Amino to stay hydrated.

Use only as directed.

⚠️ Warnings & Precautions

Some individuals experience a harmless tingling sensation, which is attributable of beta alanine.

Warning: This product is only intended for healthy adults, 18 years of age or older.

Do not use if pregnant, nursing, or currently taking PDE5 inhibitors or nitrates for chest pain. Do not take this product before consulting a licensed, qualified, health care professional of you are taking any other dietary supplement, prescription drug or over-the-counter medication; or if, you suspect you have or have been treated for, diagnosed with or have a family history of, any medical condition.

This product contains caffeine and should not be used in combination with caffeine or stimulants from other sources. Discontinue use 2 weeks prior to surgery. Immediately discontinue use and contact a medical doctor if you experience any adverse reaction to this product. Do not use this product continuously for more than 8 weeks. Do not use if safety seal is broken or missing.

Keep out of reach of children.

🧪 Formulation Notes

This product contains caffeine and should not be used in combination with caffeine or stimulants from other sources.

Additional Information

Store in a cool dry place.

This product is sold by weight, not volume. Some settling of powder may occur during shipping and handling, which may affect density of powder. This product contains the servings indicated when measured exactly by weight.

103817

Customize Your C4 Experience C4 Sport C4 Original C4 Zero C4 Ripped C4 Extreme Energy Energy Focus Pumps Endurance Sports certified Creatine nitrate Tingle free Supports weight loss Moderate Advanced Extreme

ID series Explosive high energy Pre-workout Naturally and artificially flavored 30 servings

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Product Details

UPC / SKU 8 42595 10061 7
DSLD Entry Date 2018-01-25
Product Type Other Combinations
Form Powder
Brand Cellucor
DSLD ID 82591
Data Updated 2026-04-11

Research Evidence

371 Research Sources
54 Avg Quality Score
148 Meta Analysis
82 Systematic Review
71 Rct
62 Clinical Trial
2 Regulatory Source
1 Cochrane Review
1 Narrative Review
1 Other
1 Openfda Safety
A Vitamin C supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015
A Vitamin C supplementation for the primary prevention of cardiovascular disease
Systematic Review The Cochrane database of systematic reviews 2017
A Vitamin C for preventing and treating the common cold
Meta Analysis The Cochrane database of systematic reviews 2013
A Vitamin C for preventing and treating pneumonia
Meta Analysis The Cochrane database of systematic reviews 2013
A Vitamin E supplementation in pregnancy
Meta Analysis The Cochrane database of systematic reviews 2015
A Vitamin C supplementation for prevention and treatment of pneumonia
Meta Analysis The Cochrane database of systematic reviews 2020
A Vitamin C supplementation for prevention and treatment of pneumonia
Systematic Review The Cochrane database of systematic reviews 2021
A Nutritional interventions for preventing and treating pressure ulcers
Meta Analysis The Cochrane database of systematic reviews 2024
A Does Vitamin C Supplementation Provide a Protective Effect in Periodontal Health? A Systematic Review and Meta-Analysis
Meta Analysis International journal of molecular sciences 2024
A Circulating vitamin C concentration and risk of cancers: a Mendelian randomization study
Meta Analysis BMC medicine 2021
View all evidence for Vitamin C →

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