L-tyrosine effect: 15–45 min onset
L-tyrosine supplementation leads to substantial dopamine increases within 15 to 45 minutes, lasting 30 minutes to 2 hours before tapering off.
Snapshot · Huberman Lab
Essentials: Control Your Brain Chemistry for Focus, Motivation & Well-Being
Explore episode
Aug 6, 2026
Where this was said
Dopamine Supplements: Mucuna Pruriens, L-Tyrosine, Phenethylamine (PEA)
At 14:55 · chapter starts 13:30
Moving from behavioral to chemical tools, Huberman navigates the supplement landscape with unusual candor. Mucuna pruriens tops the list for potency — it's approximately 99% L-dopa, the same Parkinson's prescription drug — but Huberman explicitly doesn't recommend it, because the dopamine spike it generates is followed by a substantial crash that undermines the very states you were trying to create [1] — Andrew Huberman "Mucuna pruriens is essentially pharmaceutical L-dopa — effective but crashes hard. L-tyrosine works within 15–45 minutes with milder, varia…" 14:07 . L-tyrosine is gentler and more variable: some people respond to 2 grams, others to 100 milligrams, and some are better off with none at all. It works within 15–45 minutes and lasts 30 minutes to two hours, sometimes with a mild energetic or emotional comedown. Phenylethylamine (PEA) is Huberman's personal favourite in this category — faster-acting and more potent, it rapidly elevates dopamine and related metabolites to produce genuine feelings of motivation and well-being. His protocol: 300–600 mg PEA stacked with L-tyrosine or Alpha-GPC, taken before workouts or focused work sessions. The section ends with a reminder that dopamine manipulations should be approached cautiously by anyone on medication for depression or mania.
The Dopamine Supplement Landscape: What Actually Works
Mucuna pruriens is essentially pharmaceutical L-dopa — effective but crashes hard. L-tyrosine works within 15–45 minutes with milder, variable effects. Phenylethylamine (PEA) is faster and more potent, and stacks well with L-tyrosine. Huberman's personal protocol: 300–600 mg PEA with Alpha-GPC before work or training.
Mucuna pruriens: 99% L-dopa
Mucuna pruriens supplement is nearly pure L-dopa — the same prescription drug used for Parkinson's — making it extremely potent but prone to a substantial dopamine crash afterwards.
PEA dose: 300–600 mg
Huberman's personal protocol includes 300–600 mg of phenylethylamine (PEA), a fast-acting dopamine booster he stacks with L-tyrosine or Alpha-GPC for motivation and alertness.
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