🟢 98/100

This product looks safe

  • Niacin: 60mg is 1.7× the Tolerable Upper Intake Level (35mg)
  • 33% 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

17 Gram(s) Serving Size
20 Servings
Other Combinations Product Type
33% 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
Calcium
48 mg (5% DV)
6 Gram(s)
📊 Market median: 2000.0mg (275 products)
Median 2000.0mg This product: 6mg
CarnoSyn
3.2 Gram(s)
1.5 Gram(s)
📊 Market median: 496.0mg (192 products) 📚 20 studies — no high-quality reviews
This product: 1.5mg
Nitrosigine
1.5 Gram(s)
C4 Ultimate Shred & Thermogenic Matrix
1.334 Gram(s)
1 Gram(s)
📊 Market median: 500.0mg (180 products) 📚 5 studies (Tier A: 0, B: 1)
This product: 1mg
Bioperine Black Pepper (Piper nigrum) fruit extract
5 mg

Other Ingredients

Silicon Dioxide Calcium Silicate Polydextrose Natural & Artificial flavors Acesulfame Potassium Sucralose Titanium Dioxide

Label Claims — Verification

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

Target Groups

Adult (18 - 50 Years) Women (not pregnant or lactating)

Product Information

📋 Directions for Use

Suggested use: Take one serving (1 level scoop) of C4 Ultimate Shred, mixed with 10-12 fl. oz. of water 20-30 minutes before training. Some individuals may experience a harmless tingling sensation, which is attributable to Beta-Alanine. Use only as directed.

⚠️ Warnings & Precautions

Some individuals may experience a harmless tingling sensation, which is attributable to Beta-Alanine. Use only as directed.

Warning: This product is only intended to be consumed by healthy adults, 18 years of age or older.

Do not use this product if you are pregnant or nursing. Before taking this product, consult a licensed, qualified, health care professional, especially if 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, including but not limited to: high or low blood pressure, diabetes, anxiety, cardiovascular, psychiatric or seizure disorders, cardiac arrhythmia, stroke, heart, liver, kidney, or thyroid disease, or difficulty urinating due to prostate enlargement. This product contains caffeine and Sceletium tortuosum (Zembrin) and should not be used in combination with other products containing caffeine or Sceletium tortuosum (Zembrin) or stimulants from other sources, including but not limited to, coffee, tea, soda, or other dietary supplements and medications.

Do not use this product continuously for more than 8 weeks. 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 if safety seal is broken or missing.

Keep out of reach of children.

Contains: Tree Nuts (Lychee Nut)

🧪 Formulation Notes

This product contains caffeine and Sceletium tortuosum (Zembrin) and should not be used in combination with other products containing caffeine or Sceletrium tortuosum (Zembrin) or stimulants from other sources, including but not limited to, coffee, tea, soda, or other dietary supplements and medications.

In Every Serving Energy Caffeine TeaCrine Rauwolfia Extract Pumps Citrulline Malate Nitrosigine Endurance CarnoSyn Beta-Alanine Focus Huperzine-A Zembrin Caffeine

In addition to the thermogenic properties of Capsimax Cayenne, Oligonol Lychee Fruit and Green Tea Extracts - every serving of C4 Ultimate Shred supports the mobilization of fats for energy production. Combining these ingredients with clinically studied DygloFit, and the nutrient enhancer Bioperine Black Pepper Extract, C4 Ultimate Shred provides the formula that you need to shred fat and reveal your ultimate physique.

Contains: Tree Nuts (Lychee Nut)

TeaCrine Capsimax Capsicum extract CarnoSyn Carnosine synthesizer Nitrosigine Zembrin AlphaSize BioPerine Gingever High-Potency Ginger Extract

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. Made in the U.S.A. using strategically sourced domestic and imported ingredients and components.

Follow @Cellucor for giveaways & updates Facebook @Cellucor Twitter @Cellucor Instagram @Cellucor

Formulated to shred

Fat burning Every serving of C4 Ultimate Shred contains the ultimate cutting formula and shred matrix. This blend is powered by clinically-studied ingredients which have been specifically selected for their ability to support fat burning and metabolism - enhancing the results of your fat-shredding workouts.

The most explosive pre-workout and cutting formula Naturally & artificially flavored 20 servings

Product Details

UPC / SKU 8 42595 10587 2
DSLD Entry Date 2019-08-23
Product Type Other Combinations
Form Powder
Brand Cellucor
DSLD ID 206273
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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