Synephrine is considered a mild stimulant somewhat similar to Ephedrine but weaker. I bought a bottle of 100 tablets of Synephrine 40 mg for €6. Mainly I'm planning to use it for workouts with my pre-workout stack.
I decided to first try Synephrine alone and on empty stomach. So I took one 40 mg tablet and the effect started at about 20 minutes later. It's feels like smooth adrenergic stimulant that provides some increase in energy and perhaps a mild mood brightening effect. I think I notice some vasoconstriction and mild increase in hand sweating as side effects. It doesn't seem to be anxiogenic which is good.
I'll report later how long the effects lasted and how well it works for boosting workouts.