Which vitamin is in your medicine cabinet

There is a public health recommendation where I live that women of childbearing age take folic acid (unexpected pregnancy) in order to prevent neural tube defects. I don't think that message has been widely accepted by the public.

I take biotin (I'm hoping it will make my hair thicker even though I know it's like...a mostly completely false hope), fish oil, vitamin D (up to 50% of adults have mild to moderate deficiency here in Canada), and magnesium (for "women's issues" since double blind RCTs showed less bloat, water retention and cramping).

When trying to be pregnant, pregnant or BF I took a pink multivitamin and like everything marketed toward maternal guilt they are overpriced compared to other multivits. I just got the massive jar from Costco.

A multivitamin
Biotin (because I have always taken it for my hair and nails)
Niacin (because the Dr said my triglycerides are high and she wants me to try a 1500 calorie diet with exercise and niacin to help with that)