BioStacks
Best for
Ingredients (8)
Caffeine
100%Dose
180 mg
Target
100–400 mg
Form
—
L-Leucine
100%Dose
2000 mg
Target
2000–5000 mg
Form
—
CarnoSyn
78%Dose
2500 mg
Target
3200–6400 mg
Form
—
Vegan BCAA Blend
80%Dose
4000 mg
Target
5000–10000 mg
Form
—
Citrulline Malate
83%Dose
5000 mg
Target
6000–8000 mg
Form
Standard
Other Ingredients (6)
Natural FlavorsFlavor
Broad regulatory category of flavor constituents derived from natural sources. Composition is proprietary and not disclosed — 'Natural Flavors' can include several hundred different compounds depending on the target flavor profile, including hexane-extracted constituents and proprietary carrier solvents. 'Natural' is a regulatory definition (21 CFR §101.22), not a safety guarantee.
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Beetroot Juice PowderColorant
Natural red colorant and mild flavoring derived from beetroot; often spray-dried onto maltodextrin carrier
Calcium SilicateAnti-caking
Inorganic compound used as an anti-caking and flow agent in powdered supplements
Citric AcidAcidulant
Natural acid derived from citrus fruits
Stevia ExtractSweetener
Zero-calorie natural sweetener extracted from the leaves of Stevia rebaudiana
How to Take It
Best taken in the morning
Morning or early afternoon only — caffeine within 8 hours of bed measurably disrupts sleep.
With or without food
On the label
Mix 1 level scoop of Gnarly Pre into 10-12 oz of water, stir or shake vigorously, 30 mins before workout. Settling may occur.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$48.95
Near the median of 165 muscle supplements
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Sources & Scoring
Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).
This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.
The score analyzes what's on the label: ingredient doses vs. studied ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.