What has Huberman said about L-Tyrosine?

Huberman describes L-tyrosine as a dopamine precursor that may support alertness, focus, and working memory, but he recommends cautious, occasional use because effects can be followed by a drop in energy or motivation.

• Typical doses: He describes common doses of 500–1,000 mg and says to start lower—about 250–500 mg—then assess your response. He cautions against copying the much higher doses used in some studies. 1
• Onset and crash: He says dopamine can begin rising about 30–45 minutes after ingestion; the effect is short-lived in the study he discusses, and some people experience a later crash. 2 3
• Caution and frequency: He advises people with conditions such as bipolar disorder, psychosis, or anxiety to avoid it, and says he uses it only occasionally rather than relying on it regularly. 4
• His personal combination: He has described taking 500 mg of L-tyrosine with 300 mg of Alpha-GPC and coffee, usually early in the day and about four days per week. He says he prefers separating and assessing ingredients, and not stacking every focus tool at once. 5 6
• Timing: He recommends taking it early in the day because it can be stimulating and may interfere with sleep. 7