BioStacks
Best for
Ingredients (12)
Vitamin B-6
100%Dose
20 mg
Target
1.3–25 mg
Form
Premium
L-Leucine
100%Dose
2500 mg
Target
2000–5000 mg
Form
—
L-Methionine
100%Dose
435 mg
Target
200–1000 mg
Form
—
L-Phenylalanine
100%Dose
715 mg
Target
500–1500 mg
Form
—
L-Histidine
100%Dose
590 mg
Target
500–4000 mg
Form
—
Other Ingredients (5)
Beet ColorColorant
Natural red-pink colorant from dehydrated beets or beet juice; the pigment is betanin
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.
Citric AcidAcidulant
Natural acid derived from citrus fruits
Guar GumThickener
Natural thickener derived from guar beans
Stevia ExtractSweetener
Zero-calorie natural sweetener extracted from the leaves of Stevia rebaudiana
How to Take It
Best taken in the evening
Contains Tryptophan, so it belongs in the evening. Vitamin B6 is easier on the stomach taken with food.
With food
Keep it away from protein-heavy meals
Space it a couple of hours from SAMe
On the label
Mix 12 grams (approximately one scoop) in 8 to 10 ounces of water per day or as directed by your healthcare practitioner.
Do not combine with St. John's Wort
Each of these raises serotonin activity on top of St. John's Wort, and together they can trigger serotonin syndrome — agitation, rapid heartbeat, raised blood pressure. Not without medical supervision.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$77.99
Pricier than 99% of 24 isoleucine 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.