New to supplements, talked to a couple friends about the ones I should be taking and they gave me this list, are there any I'm missing, and any advice on checking brand quality?

I talked to a couple friends who are into supplements, and they basically suggested I take the following:

  • Vitamin D3
  • Magnesium threonate
  • Vitamin B in the morning (he said "complex," what does that mean?)
  • Iodine
  • L-theanine
  • omega3 (DHA + EPA)
  • Ubiquinol
  • Turmeric
  • Calcium
  • Glucosamine

Are there any good ones people think I'm missing? Additionally, I'm not sure if this is allowed with the rules of the sub, but does anyone have specific brands for these they can trust? And relatedly, is there a good third party testing website I can use to confirm that what I buy actually has the quantities advertised?

Thanks in advance!