L-Tyrosine vs N-Acetyl-Selank
Side-by-side comparison of L-Tyrosine and N-Acetyl-Selank: mechanism, half-life, dose range, safety profile, and vendor pricing.
Price snapshot
L-Tyrosine
N-Acetyl-Selank
L-Tyrosine
L-Tyrosine is a non-essential aromatic amino acid and the direct biosynthetic precursor to the catecholamine neurotransmitters dopamine, norepinephrine, and epinephrine. Unlike "essential" amino acids that must be…
No vendor price on file.
Full L-Tyrosine profileN-Acetyl-Selank
N-Acetyl-Selank is the N-terminally acetylated analog of Selank, a tuftsin-derived heptapeptide used intranasally for its reported anxiolytic and nootropic effects. The acetyl group is claimed to improve stability and…
Lowest listed price: $79.99 across 2 listings
Full N-Acetyl-Selank profileSide-by-side comparison
| Attribute | L-Tyrosine | N-Acetyl-Selank |
|---|---|---|
| Category | Nootropics | Cognitive |
| Research Stage | Preclinical | Preclinical (the N-acetyl analog has no dedicated studies); parent Selank has limited clinical use in Russia |
| Mechanism of Action | L-Tyrosine's mechanism of action as a cognitive performance enhancer reflects its role as the rate-limiting substrate for catecholamine biosynthesis in the brain. The catecholamine synthesis pathway begins with phenylalanine (from dietary protein), which is… | N-Acetyl-Selank is the N-terminally acetylated analog of Selank, a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) derived from the endogenous immunopeptide tuftsin (Thr-Lys-Pro-Arg) with a C-terminal Pro-Gly-Pro tail added to slow enzymatic breakdown.… |
| Half-Life | — | Not established for the N-acetyl analog. Parent Selank has a very short plasma half-life (on the order of minutes, as expected for a small peptide) but produces behavioral effects lasting hours, attributed to active fragments and downstream enkephalin/GABA modulation. N-acetylation is claimed to slow N-terminal degradation and extend duration, but this is unquantified in published literature. |
| Typical Dose Range | — | 100-900 mcg |
| Dosing Frequency | — | Once or twice daily (intranasal); some advanced users split into 2-3 doses |
| Administration | — | — |
| Side Effects | L-Tyrosine has a highly favorable safety profile as a non-essential dietary amino acid that is normally consumed in gram quantities daily from food. Supplemental tyrosine at typical cognitive-performance doses of 500-2000 mg (or even the higher research doses… | In short Russian clinical trials, parent Selank was generally well tolerated with no serious adverse effects reported [PMID:18454096]. Reported or plausible effects (largely extrapolated to the analog): mild nasal irritation or congestion from the spray,… |
| Molecular Weight | — | ~793.9 g/mol (theoretical: Selank ~751.9 g/mol + N-terminal acetyl, ~+42). Approximate molecular formula C35H59N11O10. |
| Common Vial Sizes | — | — |
Price tracking
L-Tyrosine: potential benefits
- No structured benefit list published.
N-Acetyl-Selank: potential benefits
- Anxiolytic (calming) effects - the most-studied action of parent Selank, including a Russian clinical trial in generalized anxiety disorder [PMID:18454096]
- Nootropic / cognitive support - reported attention and memory benefits in rodent models, linked to BDNF changes [PMID:31625062]
- Stress resilience reported without the sedation, tolerance, or dependence typically seen with benzodiazepines (preclinical framing) [PMID:30255741]
- Possible support during withdrawal states (alcohol, opioid) in animal models [PMID:24913576][PMID:36322304]
- Claimed longer duration vs. plain Selank from N-terminal acetylation - a community/vendor claim not verified in published data
Frequently asked
What's the difference between L-Tyrosine and N-Acetyl-Selank?
L-Tyrosine is a nootropics that l-tyrosine's mechanism of action as a cognitive performance enhancer reflects its role as the rate-limiting substrate for catecholamine biosynthesis in the brain. the catecholamine…. N-Acetyl-Selank is a cognitive that n-acetyl-selank is the n-terminally acetylated analog of selank, a synthetic heptapeptide (thr-lys-pro-arg-pro-gly-pro) derived from the endogenous immunopeptide tuftsin…. The two differ in mechanism, half-life (not reported vs Not established for the N-acetyl analog. Parent Selank has a very short plasma half-life (on the order of minutes, as expected for a small peptide) but produces behavioral effects lasting hours, attributed to active fragments and downstream enkephalin/GABA modulation. N-acetylation is claimed to slow N-terminal degradation and extend duration, but this is unquantified in published literature.), and typical dose range.
Which has the longer half-life, L-Tyrosine or N-Acetyl-Selank?
L-Tyrosine has a half-life of not reported. N-Acetyl-Selank has a half-life of Not established for the N-acetyl analog. Parent Selank has a very short plasma half-life (on the order of minutes, as expected for a small peptide) but produces behavioral effects lasting hours, attributed to active fragments and downstream enkephalin/GABA modulation. N-acetylation is claimed to slow N-terminal degradation and extend duration, but this is unquantified in published literature.. Longer half-lives generally mean less frequent dosing but slower on/off kinetics.
Can you stack L-Tyrosine and N-Acetyl-Selank?
Stacking depends on mechanism overlap, safety profile, and goals. L-Tyrosine and N-Acetyl-Selank should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds.
See current vendor prices
Listings from the vendors we track. Prices change often, so check the vendor before you buy.
Before you buy L-Tyrosine or N-Acetyl-Selank
Check the vendor trust score. Every supplier we track is rated 0-100 on COA verification, payment transparency, shipping, reviews, and listings: one published, reproducible methodology, applied to every vendor.
Related comparisons
Research use only. BodyHackGuide is a research and price-comparison reference. The compounds discussed on this page are not approved by the FDA for human consumption and are sold strictly for laboratory research. Prices shown are pulled from vendor listings tracked on BHG and are subject to change. We earn an affiliate commission on some outbound clicks, and every vendor is ranked on the same public, reproducible methodology. See editorial standards and affiliate disclosure.