When I do decide I need a specific supplement, I lean towards whole food supplements. Though I am not too fond of taking specific nutrients, it is organic and cultured and what I have used when taking a specific supplement, and will continue to until I find something I am more comfortable with...
For the most part I only take whole green foods like Vitamineral Greens, Wheat Grass, Chlorella, Spirulina and, seaweeds, kelp and dulse . The seaweeds are two products I use most every day along with the Vitamineral Greens, the rest, only as I sense need.