My experience lies solely with N-acetyl-L-tyrosine, which is more readily absorbed by the brain. I recommend taking it concurrently with vitamins b and c, or any vitamins that nourish your nervous system. It definitely helps replenish the neurotransmitters. It's a stimulant, so you'll feel more alert. I wouldn't say it gives you energy, just helps your brain work more clearly and ups your mood. There's no aftereffects I can detect. I recommend it for anyone feeling the need for serotonin boost; as an over-the-counter alternative to prescription mood boosters. *edit* Though tyrosine helps, I was actually thinking of 5-HTP here.
It's definitelyl not as powerful as Remeron/mirtazapine - something my doctor prescribes - in boosting serotonin production. I've discovered that if you take n-acetyl l-tyrosine concurrently with mirtazapine it just amplifies the serotonin boost by providing some raw ingredients to work with. I typically take 150mg of n-acetyl l-tyrosine twice daily.
Tanning? Really? Hard to believe ....