After my unsuccessful Modafinil experience, this time I decided to give Sulbutiamine a try.
Sulbutiamine is a lipophilic (fat-soluble) analogue of Vitamin B1 (thiamine) which crosses the blood-brain-barrier easier than thiamine itself. Its main mechanism of action is thought to occur in the part of the brain which affects motivation and arousal, explaining its positive effects on mood and energy.
Sulbutiamine is shown to increase cholinergic activity in the hippocampus, meaning that it positively affects acetylcholine levels in the brain, improving memory. It also potentiates glutamatergic activity in the prefrontal cortex (PFC) - the part of the brain used in co-ordinating complex cognitive behaviour, decision making and moderating correct social behavior. When sulbutiamine acts on the PFC, it affects intrasynaptic glutamate levels which ultimately improves both memory and mental performance.
I decided to go with Arcalion by Servier which is USP-grade and sold only in pharmacies. I bought it myself and I know it's legit.

It comes in 200mg tablets and contains 30 tablets in total. The therapeutic dosage has been reported to be 12.5 mg/kg, which corresponds to 850 mg for a 68 kg (150 lb) person. However, it should be noted that dosage recommendations vary. The manufacturer of Arcalion, for example, recommends no more than 600 mg per day. One box costs about $30.
13:00: I got it on the mail today and immediately took one 200mg tablet after a heavy meal containing about 30g of protein, 20g of fat and 100g of carbs. Keep in mind that this ingredient is fat-soluble so it probably won't work very well if at all if taken on an empty stomach or with a fat-free meal. Same goes for all other fat-soluble vitamins.
20:00: At the time of writing this post I am not feeling any effect except maybe an energy drink-like rush. Mental energy of sorts, but am not sure if it's real.
I will keep writing this log until the box is out or I decide to quit for other reasons.