What is the most effective supplement you have ever taken?

Hi, I have read a few reddit posts about what is the best/most effective/go to supplement. I have always been a firm believer in the wisdom of crowds, so I read each post and totalled up the results for each supplement by how many individual comments mentioned them. Here they are:

40 - Magnesium 32 - Vitamin D
24 - Omega 3/fish oil 14 - NAC 14 - Ashwaghanda 14 - L theanine 10 - Lions mane 10 - Vitamin B12 10 - Vitamin K2 8 - Taurine 7 - GABA 6 - Creatine 5 - Lithium oranate 4 - CBD 4 - Vitamin C 4 - Q10 4 - Glycine

Then there were a lot only mentioned 3 times, 2 and so on.

The results aren't surprising as Vitamin D deficiency and Magnesium deficiency are so common so you would thing a lot of people might benefit from taking them.

Hopefully this post might help you guys to see what might be useful to you.

Thanks for reading.