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Niacin, an over the counter in vitamin section
Vitamin C (search 'Vitamin C' under the search engine)
Some ways to strengthen your immune system is to eat healthy foods(of course), take vitamins, just some simple stuff that most people only do when they have a cold. the main type of vitamin that boost the immune system is vitamin c
You can try Respivax or Vitamin C it really helps.
Vitamin A
Take Vitamin B more regularly or go to your doctors?
You can take vitamin A,C and you can also take many other different vitamins as well. You can also take a mixed vitamin or a supplemental vitamin as well to help.
Yes, actually you SHOULD take Vitamin D3. You have two choices of Vitamin D, Vitamin D2 and Vitamin D3. Vitamin D2 is not absorbed as well as Vitamin d3 and it has a shorter half life. Even though foods are still fortified with Vitamin D2, many researchers believe that Vitamin D2 is "no longer suitable for supplementation or fortification".
While there will be no negative side effects from taking these vitamin capsules on an empty stomach you should take these with a meal to get full benefit from them. Taking these while your digestive system is breaking down your meal ensures that more of the nutrients are absorbed by your system.
drinking lots of water can take days and weeks to get it out of your system but there are special drinks that will do it in a few hours that you may be able to get from your local pharmicist
vitamin C
Yes