Originally Posted by GRB5111

s93uv3h - I'm hesitant to recommend a dose or compare different manufacturers, because I don't know enough about the efficacy of these to provide any accurate guidance. I think if you've had your D3 levels tested with a dependable testing method and know you're low or lacking, it enables you to find a well-reviewed source of D3 to correct any deficiency. Some on this forum may have already done that, so they may chime in with their findings/ recommendations. All the best!