When messing with such things as vitamins I treat them like any other medication. They don't mix well. SO make sure you get the facts about them, and do your research much like you are now.
WHY?
They give you you dose of vitamins, but if you are getting that dose from what you eat, you can upset the balance in your body. I have no really proof of this, which is why I say the word, "can". I am implying that it is possible that I'm wrong. However, I will give you this that may support my theory of just how much risk there is in messing with our vitamins and minerals.
Serotonin: From Bliss to Despair
"too much Serotonin can produce a life-threatening condition known as Serotonin Syndrome (SS).
Also avoid combining antidepressants with any herbal substances reported to be of help in Depression such as St. John's Wort."
"The neurotransmitter, 5-hydroxy-tryptophan (5-HTP)is a compound created in the body which is used to regulate serotonin levels in brain and central nervous system.
The fact that there have been so few studies on 5-HTP leads me to think there are side effects which are unknown to us still. Still, the consumer should consider 5-HTP for the stated ailments but should be wary to the possibility of averse reactions."-
5htp myth
The vitamins/minerals/herbs and such are no longer natuaral, they are concentrated prcessed "pills", in my humble opinion at least. The natural way would be to simply eat healthy, but we can't always do that, can we. I strongly urge you to ask a doctor, or some one who may understand thses things, that isn't trying to sell to you.
Peace and kindness be with you.