L-Tyrosine
Of 3,420 on-market l-tyrosine products in the January 2026 DSLD dump, the median declared dose is 430 mg, and 75.2% list L-Tyrosine (free-form amino acid) as the primary form.
Form share
Of 3,409 products with an identifiable primary form, here is the share held by each form of L-Tyrosine on the market today.
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| Form | Quality tier | n | Share |
|---|---|---|---|
| L-Tyrosine (free-form amino acid) | Tier 1 | 2,564 | 75.2% |
| N-Acetyl-L-Tyrosine (NALT) | Unrated | 845 | 24.8% |
Form share over time
Entry-year breakdown of the top forms, 2012–2025.
Dose distribution
Deciles of declared dose per serving (mg), among 2,021 products with a disclosed amount.
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- 47.2% of products fall below the fairy-dust threshold (400 mg, 20% of the studied low dose).
- 39.9% of products don't disclose an amount because L-Tyrosine is declared inside a proprietary blend.
Where does your dose rank?
Enter a per-serving dose (mg) to see exactly how it compares to the 2,021 on-market l-tyrosine products with a disclosed amount. The chart above groups doses into deciles; this looks up the exact percentile for one number.
By dosage form
By target group
Top brands
Search interest over time
How often people search for l-tyrosine on Google, US only, the last 5 years. This is public interest, not DSLD label data — a spike here doesn't necessarily line up with anything on this page, and Google's own index (100 = that term's peak popularity in the chosen window) is relative, not an absolute search-volume count.
Or see this search directly on trends.google.com.
Forms explained
The form used in the oral human trials cited on the compound (McAllister 2024, Coull 2016, Steenbergen 2015); in Coull 2016 a single 150 mg/kg dose raised serum tyrosine as much as a double dose. "Micronized", "fermented" and "HPLC" describe particle size, origin or assay, not a distinct chemical form.
Source: Coull N et al. 2016, Med Sci Sports Exerc 48(2):277-286, PMID 26285023; McAllister MJ et al. 2024, Stress 27(1):2375588, PMID 38975711
No verified oral human comparison with free tyrosine. The only human data located were intravenous: in healthy volunteers and hemodialysis patients plasma tyrosine did not rise after infused N-acetyltyrosine (unlike alanyl- and glycyl-tyrosine), and about 60% of the infused amount was excreted in controls -- parenteral nutrition findings that do not directly transfer to oral supplements.
Source: Druml W et al. 1991, Am J Physiol 260(2 Pt 1):E280-E285, PMID 1996632 (intravenous, not oral)
Reference values
- RDA (adult): not established — Non-essential (conditionally essential) amino acid made from phenylalanine; no individual RDA/AI exists for tyrosine alone.
- Tolerable Upper Intake Level (adult): not established — Not established -- no IOM/EFSA/FDA UL exists for supplemental tyrosine.
- Studied clinical dose range: 2000–2000 mg
- McAllister MJ et al. 2024, Stress 27(1):2375588, PMID 38975711 -- RCT (n=80), single dose of L-tyrosine 2000 mg (n=28) vs L-theanine 200 mg (n=25) vs placebo (n=27) before a virtual-reality stressor and cognitive challenge; no effect on salivary stress markers (alpha-amylase, secretory IgA), but fewer missed responses on the Stroop task than placebo. Weight-based doses in other trials: Coull N et al. 2016, Med Sci Sports Exerc 48(2):277-286, PMID 26285023 -- 75 or 150 mg/kg body mass, two doses (study 1, n=21); one 150 mg/kg dose raised serum tyrosine as much as a double dose, but tyrosine did not change cognitive or physical performance in the heat (study 2, n=8). Review context: Attipoe S et al. 2015, Mil Med 180(7):754-765, PMID 26126245 -- rapid evidence assessment (10 RCTs, 4 controlled trials) found a weak recommendation for tyrosine under cognitive stress and insufficient evidence for physical performance.
- Note: Unit basis: mg of L-tyrosine. N-acetyl-L-tyrosine (NALT) rows declared by name are the weight of NALT and are converted by molecular weight (x0.812 = 181.19/223.23) to a tyrosine-equivalent; this is stoichiometry, not absorption (see the NALT form for the limited human data). Rows declared in grams are normalized to mg by the pipeline. The studied range is a single verified fixed dose; weight-based trials used larger absolute amounts. 3,5-diiodotyrosine/iodotyrosine rows (thyroid-hormone precursors, iodine products) and tyrosine esters/salts such as the tartrate or ethyl ester HCl are different materials and are deliberately not aliased (a dry run confirmed they stay unmatched).