I need to get supplements for my staff - Vitamins...

How to take vitamin D supplements?
In case you have vitamin D deficiency, the dose will be 50000 IU is taken one pill per week for 6-12 weeks, and you must make sure that you need vitamin D. Otherwise, you might have an elvated level of Vitamin D in the blood or what is known as vitamin D toxicity. It's also advised to increase the intake the foods which are richin vitamin D such as eggs, meat, fruits and salads, and exposure to sunlight daily at a rate of half an hour daily
How can you take zinc?
Zinc can be taken orally no more than 4 mg per day, but if you want to take pills on a daily basis, please follow up with a doctor. Zinc is a very beneficial nutrient, and it also has a role in inhibiting the proliferation of the new coronavirus. Zinc is found in red meat, poultry, and fish
How can YOU take vitamin C pills?
The permissible dose for vitamin C per day ranges between 75-90 mg per day, and it is not recommended to use these pills without the need or medical supervision, because taking an extra dose of vitamin C may be harmful. The vitamin is found in many foods, especially Lemon, citrus and others
What advice?
It is not recommended to use food supplements indiscriminately and without the need to use them