I'm afraid I can't advise on dose but it is best to choose an easily absorbed form and take vitamin C at the same time as each dose. Taking a B vitamin complex once a day is also a good idea.
The serum alkaline phosphate isn't usually anything to worry about if it's mildly elevated and there are no other markers of liver problems but it's a good idea to get it checked again. Sometimes it can be elevated temporarily.
Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.
Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.