Research topics described below are educational context, not a promise to diagnose, treat, cure, or prevent disease. Review the ingredient, suggested-use, warning, and interaction information before ordering, and ask a qualified healthcare professional if the product may not be appropriate for you.
Pre-orders are opening soon. When they open, your $100 USD payment will create a physical pre-order for this product and will be applied to its final declared price. At $100 or less, we will refund any unused amount automatically and ship when ready. Above $100, we will email only for the balance.
Campaign milestone: 1,000 units for this product. When pre-orders open, orders may continue beyond the milestone; it is a production target, not an inventory cap.
Free-form L-tyrosine, presented without daily-stimulant promises. The planned specification is 500 mg per capsule of free-form L-tyrosine from a fermentation route; supplier identity, route evidence, final formulation, final label and finished-lot results remain pending. Research on free-form L-tyrosine does not establish that one planned 500 mg capsule will reproduce results from the much larger doses used in many acute-stress studies.
At a glance
| Active ingredient | L-tyrosine |
|---|---|
| Strength | 500 mg per capsule |
| Form and source | Planned specification: free-form L-tyrosine from a fermentation route; supplier and route records pending |
| Pack | 90 capsules |
| Pre-order payment | $100 USD, recorded on this physical product order and applied to the final declared price; automatic shipment at $100 or less; balance request only above $100 |
| Product milestone | 1,000 units; pre-orders can continue after the target is reached |
Sourcing and quality
The planned specification is free-form L-tyrosine from a fermentation route. Supplier identity, manufacturing site, route evidence, final formulation, final label and finished-lot results remain pending. Pure City’s stated release plan requires suitable finished-lot testing and publication of the lot report before shipment. Any pharmacopeial claim will be made only if the exact current standard, source, method and supporting record are verified. Read what our supplement quality terms mean.
What the evidence does—and does not—say
Human evidence is moderate for preserving some cognitive performance during unusual acute stress, including sleep deprivation and cold exposure. Many positive studies used 100–150 mg/kg—far more than a single 500 mg capsule—and smaller doses have weaker or mixed support. Evidence does not justify claims for routine daily motivation, ADHD, depression, thyroid support, or reliable exercise improvement. This product is not presented as a treatment for any condition.
Side effects and interactions
Possible effects include nausea or other stomach upset, headache, heartburn, jitteriness, anxiety, irritability, insomnia, palpitations, or changes in blood pressure. Do not combine L-tyrosine with monoamine oxidase inhibitors (MAOIs). Obtain prescriber approval before use with levodopa or other Parkinson’s medicines, thyroid medicines, prescription stimulants, decongestants, psychiatric medicines, high-dose caffeine, or other catecholamine-raising products. Avoid unsupervised use with hyperthyroidism, uncontrolled hypertension, significant anxiety or mania risk, during pregnancy or breastfeeding, or in phenylketonuria care.
Safety notice: This is a dietary supplement, not a medicine. It is not intended to diagnose, treat, cure, or prevent disease. Do not start, stop, or change a prescribed medicine based on this page. Follow the final product label and consult a qualified healthcare professional when appropriate.
Ingredient guides: L-tyrosine evidence, forms and dose context · L-tyrosine sourcing verification guide
