BioStacks
Best for
Ingredients (11)
L-Leucine
100%Dose
2000 mg
Target
2000–5000 mg
Form
—
L-Methionine
100%Dose
200 mg
Target
200–1000 mg
Form
—
L-Lysine HCl
85%Dose
850 mg
Target
1000–3000 mg
Form
—
L-Threonine
95%Dose
475 mg
Target
500–4000 mg
Form
—
L-Phenylalanine
70%Dose
350 mg
Target
500–1500 mg
Form
—
Other Ingredients (3)
Coating (unspecified)Coating
Generic tablet coating declaration where the label does not itemize the coating's components; modern aqueous film coatings are typically cellulose-based (HPMC) with a plasticizer
Microcrystalline CelluloseBinder
Plant-derived cellulose used as a binder and filler in supplements
Sunflower Seed OilCarrier
Common vegetable oil from sunflower seeds used as a carrier in softgels for fat-soluble nutrients
How to Take It
Best taken in the evening
Take at night. Other amino acids compete for brain uptake, so a protein-heavy meal blunts it. Take it between meals, away from food.
On an empty stomach
Keep it away from protein-heavy meals
Space it a couple of hours from SAMe
On the label
Adults take 4-8 capsules daily, or as recommended by your healthcare practitioner, with 8 ounces of water or your favorite beverage. May be taken with or without food.
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
$44.99
Pricier than 85% of 28 leucine 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.