Metabolic Nutrition Synedrex, Pre-Contest Prep, Watermelon, 14.8 oz (420 g) supplement bottle
Metabolic Nutrition

Synedrex, Pre-Contest Prep, Watermelon, 14.8 oz (420 g)

What We Researched
22 active ingredients analyzed · 10 inactive ingredients decoded · 1 retailer compared · Last updated: Mar 2026
62
Product Score Fair

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Choose Your Strength Strong Maximum
High Potency Energy Stimulants 354.2 mg 708.4 mg
Caffeine Anhydrous 250 mg 500 mg
Eria Jarensis 100 mg 200 mg
Yohimbine HCl 3 mg 6 mg
Alpha Yohimbe 1.2 mg 2.4 mg
Nootropic Mental Clarity 1,000.1 mg 2,000.2 mg
Choline Bitartrate 500 mg 1,000 mg
N-Acetyl L-Tyrosine 500 mg 1,000 mg
Huperzine-A 100 mcg 200 mcg
Thermogenic Reactive Extracts 65 mg 130 mg
Gamma Butyrobetaine GBB 25 mg 50 mg
Evodiamine 25 mg 50 mg
Grains of Paradise 15 mg 30 mg
Keto Fat Metabolic Mobilizers 1,000.15 mg 2,000.3 mg
MCT Powder (80%) 500 mg 1,000 mg
L-Carnitine Tartrate 500 mg 1,000 mg
Polythyronine 150 mcg 300 mcg
Absorption Reagents 1,553 mg 3,106 mg
Beta Alanine (Vasodilator) 1,500 mg 3,000 mg
Naringin (98% extract) 50 mg 100 mg
Black Pepper (95% Piperine) 3 mg 6 mg
Bioavailability Good

Absorption Rating

  • Choose Your Strength Fair
  • Caffeine Anhydrous Good
  • Eria Jarensis Fair
  • Yohimbine HCl Good
  • Alpha Yohimbe Fair
  • Nootropic Mental Clarity Good
  • Choline Bitartrate Poor
  • N-Acetyl L-Tyrosine Fair
  • Huperzine-A Good
  • Gamma Butyrobetaine GBB Good
  • Evodiamine Fair
  • Grains of Paradise Good
  • MCT Powder (80%) Fair
  • L-Carnitine Tartrate Poor
  • Absorption Reagents Fair
  • Beta Alanine (Vasodilator) Good
  • Naringin (98% extract) Fair
  • Black Pepper (95% Piperine) Good
Other Ingredients Good

Fillers & Additives

  • Cyclodextrin
  • Natural and artificial flavoring
  • Sodium Citrate
  • Citric Acid
  • Sucralose
  • Acesulfame Potassium
  • Sodium
  • Fd&c red 40 alum lake High
  • FD&C Red 40 Low
  • Silica
Efficacy Poor

Dosage Analysis

  • Caffeine Anhydrous 250 mg Effective
  • Eria Jarensis 100 mg Under-dosed
  • Yohimbine HCl 3 mg Under-dosed
  • Alpha Yohimbe 1.2 mg High
  • Choline Bitartrate 500 mg Effective
  • N-Acetyl L-Tyrosine 500 mg Effective
  • Huperzine-A 100 mcg Effective
  • Gamma Butyrobetaine GBB 25 mg Under-dosed
  • Evodiamine 25 mg Under-dosed
  • Grains of Paradise 15 mg Under-dosed
  • MCT Powder (80%) 500 mg Under-dosed
  • L-Carnitine Tartrate 500 mg Effective
  • Beta Alanine (Vasodilator) 1,500 mg Under-dosed
  • Naringin (98% extract) 50 mg Under-dosed
  • Black Pepper (95% Piperine) 3 mg Under-dosed

Supplement Facts

Ingredient Amount % Daily Value
Choose Your Strength Strong Maximum
High Potency Energy Stimulants 354.2 mg 708.4 mg
Caffeine Anhydrous 250 mg 500 mg
Eria Jarensis 100 mg 200 mg
Yohimbine HCl 3 mg 6 mg
Alpha Yohimbe 1.2 mg 2.4 mg
Nootropic Mental Clarity 1,000.1 mg 2,000.2 mg
Choline Bitartrate 500 mg 1,000 mg
N-Acetyl L-Tyrosine 500 mg 1,000 mg
Huperzine-A 100 mcg 200 mcg
Thermogenic Reactive Extracts 65 mg 130 mg
Gamma Butyrobetaine GBB 25 mg 50 mg
Evodiamine 25 mg 50 mg
Grains of Paradise 15 mg 30 mg
Keto Fat Metabolic Mobilizers 1,000.15 mg 2,000.3 mg
MCT Powder (80%) 500 mg 1,000 mg
L-Carnitine Tartrate 500 mg 1,000 mg
Polythyronine 150 mcg 300 mcg
Absorption Reagents 1,553 mg 3,106 mg
Beta Alanine (Vasodilator) 1,500 mg 3,000 mg
Naringin (98% extract) 50 mg 100 mg
Black Pepper (95% Piperine) 3 mg 6 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Cyclodextrin Generally_safe

It is used to improve the solubility and bioavailability of certain ingredients.

Natural and artificial flavoring Unknown
Sodium Citrate Safe

Stabilizes pH and helps maintain ingredient effectiveness.

Citric Acid Safe

Adds tartness and acts as a natural preservative. Also aids in ingredient stability.

Sucralose Generally_safe

Adds sweetness to chewables, gummies, and powdered supplements without calories.

Acesulfame Potassium Generally_safe

It is used to provide sweetness without adding calories.

Sodium Generally_safe

It may be added to supplements to improve electrolyte balance or as a component of other ingredients.

Fd&c red 40 alum lake Unknown
FD&C Red 40 Caution

It is used to add color to the supplement.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Price Comparison

iHerb $18.86
Best Price

Price History

Tracked across major retailers. Updated periodically.

$20$19$18$17$16 Mar 12 $18.00
iHerb

Prices shown at time of last check. Click a retailer to see current price. GoodSupp is not affiliated with any retailer.

Brand Trust Report
Metabolic Nutrition

Founded 1987 · Tamarac, Florida, United States · 113 products · metabolicnutrition.com/

Transparency

2 claims
In House Testing — Verified Source

Violation History

1 incident
Fda Warning Products Synedrex and E.S.P. Extreme were found to contain 2-aminoisoheptane (DMHA), an ingredient that the FDA considers to be a new dietary ingredient for which a New Dietary Ingredient notification is required and has not been submitted. The FDA stated that in the absence of such a notification, the products were considered adulterated.2019-04-10Source
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Frequently Asked Questions
Is Metabolic Nutrition Synedrex, Pre-Contest Prep a good supplement?

Metabolic Nutrition Synedrex, Pre-Contest Prep, Watermelon, 14.8 oz (420 g) received a product quality score of 62/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. The product contains 22 active ingredients Of the 10 inactive ingredients, 3 are rated safe and 1 are flagged for review.

What are the ingredients in Metabolic Nutrition Synedrex, Pre-Contest Prep?

Metabolic Nutrition Synedrex, Pre-Contest Prep contains 22 active ingredients: Choose Your Strength (Strong), High Potency Energy Stimulants (354.2 mg), Caffeine Anhydrous (250 mg), Eria Jarensis (100 mg), Yohimbine HCl (3 mg), Alpha Yohimbe (1.2 mg), and 16 more. Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Metabolic Nutrition Synedrex, Pre-Contest Prep safe to take?

Metabolic Nutrition Synedrex, Pre-Contest Prep, Watermelon, 14.8 oz (420 g) has been analyzed for ingredient safety across all its components. Of 10 inactive ingredients, 3 are rated safe. 1 ingredient is flagged for review: FD&C Red 40. 'Caution' doesn't mean dangerous — it indicates the ingredient has some considerations worth being aware of, such as potential sensitivities or ongoing research. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.