I have read and experienced that several vitamin and chemical levels in your body can be effected.
I take an expensive multi-vitamin that also has green food powders (spirulina, etc.) several amino acids (including L-tyrosine), vegetable powders, fruit powders, mushroom powders, digestive enzymes, omega fat complex, and bioflavanoid complex. It is $10 for 30 pills (bottle says 3 per dose) and $27 for 90 at my local health food store.
I do not believe I am the gullible type prone to placebo. I think it works. I am prescribed Vyvanse 60, do opiates and smoke the reef. I feel healthier and it seems it is more effective. I have not experienced worse side effects. If anything, bad side effects are more mild with the supplements.
I just started taking it about a week ago. I will let everyone know if my situation changes.