Amino acids

Behavioural and cognitive effects of tyrosine intake
Modest but significant improvements in cognitive function under demanding conditions.
L-Tyrosine: the precursor to dopamine, which aids concentration
Multiple authors
2015
5-HTP
100 mg a day for 12 weeks improves cognition and mood in older people.
5-HTP: supporting mood and cognitive function as we age
Multiple authors
2025
Tryptophan and 5-HTP
A significant increase in plasma serotonin levels in adults and children.
5-HTP: the natural precursor of serotonin
Multiple authors
2025
The effects of 5-HTP, taken as a capsule or in a functional food bar, on mood, sleep and cortisol
150 mg per day significantly improves mood and sleep whilst reducing cortisol levels.
5-HTP: mood, sleep and cortisol in a single supplement
Multiple authors
2024
The effects of oral GABA administration on stress and sleep
14 studies identified: effects on stress and sleep; safe dose up to 18g/day.
GABA: the relaxing neurotransmitter as a supplement
Hepsomali P et al.
2020
GABA
GABA improves heart rate variability and sleep quality, and reduces anxiety.
GABA: relaxation that can be measured scientifically
Multiple authors
2025
L-carnitine (2)
A significant reduction in post-exercise lactate levels and an improvement in aerobic capacity (14 studies, 257 athletes).
L-Carnitine: recover more quickly after exercise
Multiple authors
2024
L-carnitine and exercise-induced muscle damage
Reduction in markers of post-exercise muscle damage.
L-Carnitine: protecting your muscles during training
Multiple authors
2025
L-carnitine and body weight and composition
Significant reduction in weight, BMI and body fat. Recommended daily dose: 2000 mg.
L-Carnitine: burning fat with the right dose
Multiple authors
2020
Effect of tyrosine supplementation under stress or when under cognitive strain
Tyrosine counteracts declines in working memory caused by stress or fatigue.
L-Tyrosine: keeping a clear head under pressure
Jongkees BJ et al.
2015
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