Follow the instructions carefully.
From Fallen London Wiki
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From: Employ F.F. Gebrandt's Tincture of Vigour!
(Uses half the bottle.)
Unlocked with 
1 x F.F. Gebrandt's Tincture of Vigour
Locked with 
A Person of Some Importance -
Success
Spoonful by spoonful
One spoonful before each meal. Another before you extinguish your bedtime candle. It does seem to have an invigorating effect.
Wounds is dropping… (-3 CP)
You've lost 1 x F.F. Gebrandt's Tincture of Vigour- You've gained 1 x F.F. Gebrandt's Tincture of Vigour: Half-Full
Subtle is increasing… (+1 CP, up to level 5)
