What are the side effects of l-tryptohan and Ritalin?

L-tryptophan can cause side effects such as gastrointestinal issues, drowsiness, and headaches. It can also lead to more serious effects like serotonin syndrome when taken in high doses or combined with other serotonergic medications. Ritalin (methylphenidate) may cause side effects including insomnia, increased heart rate, anxiety, and potential for dependence. Both substances should be used under medical supervision to mitigate risks.