What vitamin can i take if i have hypothyroid, cholesterol, depression & anxiety?

None: The four conditions you are describing are serious medical conditions that need to be evaluated and treated by your physician. A general multivitamin may help, and in some cases of hypothyroidism and depression vitamin D or one of the B vitamins may help. However, these should not be a substitute for proper medical care, and should only be taken with guidance from a physician.

Vitamin: Assuming a reasonably well balanced diet there is no need to take supplemental vitamins,None of your reported conditions relates to vitamin deficiency.Hypothyroidism can cause high cholesterol. Most people especially if northerners or darker skinned tend to be vitamin D deficient,Also the modern diet is relatively folate and Magnesium poor.