A successful local logon begins when a user presses CTRL+ALT+DEL. Winlogon and the GINA DLL collect the user's credentials and then send the credentials to the LSA. The LSA verifies the user's identity and then returns a logon success and the user's access token to Winlogon and the GINA DLL.
Most people do not commonly experience side effects with vitamin D, unless too much is taken. Some side effects of taking too much vitamin D include weakness, fatigue, sleepiness, headache, loss of appetite, dry mouth, metallic taste, nausea, vomiting, and others.
Too much of any good thing is a bad thing. Too much vitamin D can cause an abnormally high blood calcium level, which could result in nausea, constipation, confusion, abnormal heart rhythm, and even kidney stones. It's nearly impossible to get too much vitamin D from sunlight or from foods (unless you take way too much cod liver oil).