BioStacks
Best for
Ingredients (8)
Caffeine Anhydrous
100%Dose
350 mg
Target
100–400 mg
Form
—
Alpha-Glyceryl Phosphoryl Choline (GPC) 50%
100%Dose
300 mg
Target
100–500 mg
Form
—
Potassium
100%Dose
260 mg
Target
99–500 mg
Form
—
Beta-Alanine
100%Dose
3600 mg
Target
3200–6400 mg
Form
—
L-Theanine
100%Dose
350 mg
Target
100–250 mg
Form
—
Nutrition
Calories, macros & sodium.
- Sodium110 mg
Other Ingredients (6)
ErythritolSweetener
Witkowski et al. 2023 (Nature Medicine, PMID 36849732) reported elevated plasma erythritol associated with major adverse cardiovascular events (MACE) in two cohorts (n=4,000+), with in-vitro and ex-vivo evidence of enhanced platelet aggregation. Replication is ongoing; FDA and EFSA have not changed their safety positions, but the signal is real and the additive is purely cosmetic. Better-established concern: GI tolerance — single doses above ~50 g cause osmotic diarrhea. Lower threshold for children.
Fruit Juice (unspecified)Colorant
Juice or juice concentrate used primarily for natural color and flavor in gummies
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
Spirulina Extract (Color)Colorant
Natural blue colorant derived from the cyanobacterium Arthrospira platensis (spirulina); the pigment is phycocyanin
Stevia ExtractSweetener
Zero-calorie natural sweetener extracted from the leaves of Stevia rebaudiana
How to Take It
Best taken in the morning
Contains Caffeine, which is stimulating — keep it to the morning. Take it with food — the choline and potassium in it are what makes this kind of product feel nauseating on an empty stomach.
With food
On the label
Mix a serving of this preworkout for women and men with water, swig it down, and get fired up and zeroed in and crush your workout . . . and without the jitters, upset stomach, or post-workout crash.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$39.99
Pricier than 70% of 660 calcium 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. clinical 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.