Symeon,
Sorry I missed this post. It is a subject that I am interested in. You make good points. I am an advocate of taking supplements. My favorite store is Tau. And I have taken Omega-3 supplements for sustaining health of the neurological functions. I found an excellent supplement made from black seed oil. It's in oil form and comes from a seed, not fish, so you can take it every day. But, I also look at the label to see the content of the capsules of supplements. I look for the vegetarian capsule. If it says gelatine capsule then I do consider that. If it's during lent for Christmas or Great Lent then I avoid those. Or on Wednesdays and Fridays.
Many people don't realize that the vitamins and supplements they take are actually encased in capsules made of animal gelatin (from their bones).
Joanna