L-Tyrosine is an amino acid found in the diet that is involved in producing catecholamines such as dopamine and adrenaline, specifically it is the amino acid that itself is metabolized to produce these neurotransmitters. It is investigated as a supplement based on the idea that supplementing L-tyrosine will provide more 'building blocks' for these catecholamines to be produced and hopefully, indirectly, provide benefits secondary to them. As it is also structurally related to thyroid hormones meaning that, due to relations to both adrenaline and the thyroid, it is commonly found in fat loss supplements to a degree.

When it comes to the topic of actually increasing dopamine and adrenaline outright, L-tyrosine does not seem to hold much promise. The synthesis of catecholamines is highly regulated in the body and in particular the one enzyme that converts L-tyrosine into the next metabolite, L-DOPA, so simply increasing the amount of L-tyrosine in your body does not necessarily increase catecholamine production.

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