These are vitamins created by your body when you pick up the guitar and pay attention to what you are doing. You cannot find them in pill form, and you work on them as you hear the need for them, not all at once:
Vitamin A1 = Accuracy, A2 Articulation, A3 Attention
Vitamin C1 = Concentrate, C2 Correct C3 Context
Vitamin D = Dream
Vitamin E = Expression
Vitamin F1 =Flow, fluid F2 Feeling F3 Freedom, flexibility
Vitamin I1= Interpretation I2 Intuition I3 Improvise
Vitamin K = Know your stuff
Vitamin L1 = Legato, L2 Listen to yourself
Vitamin M1 = Memorize, M2 Musicality M3 Metronome
Vitamin P1 = Practice, P2 Proprioception (when you can find a note without looking), P3 Phrasing P4 Prepare
Vitamin R1 = Rubato R2 Relax!
Vitamin S1 = Sound (see T1) S2 Slurs S3 Sight-read S4 Study S5 Speed S6 Spur of the Moment S7 Slo-o-o-w S8 Sing!
Vitamin T1 = Tone, T2 = Technique, T3 Timing T4 Tuning
Vitamin V1 = Vibrato V2 Versatility
Vitamin W = Watch!
Too much fun can be had coming up with these in lessons, as if you can ever have too much fun. I'll be adding to the list when I have time.