Often times a negative behavioral trait can be attributed to a borderline deficiency of magnesium or B vitamins. The nice thing about adding these nutrients is that you'll see an improvement in a very short period of time (usually within a few days).
Below are products that offer these nutrients, including some comprehensive multi-vitamin preparations that meet additional needs.
Other supplements can be considered to offer adaptogenic herbs and amino acids that have a calming impact, reduce anxiety, and alleviate depression (such as CurOst products and ForeCalm).
For materials on this topic, please visit the Resource Library on Behavior.