Clinical perspective, offered as context rather than as advice. The useful move here is to separate what is established from what is widely repeated. Those two sets overlap less than the confident tone of most write-ups suggests, and the second set is where nearly all the disagreement on this board comes from.

Dr.RaviCardio said:

The useful move here is to separate what is established from what is widely repeated.

Mine went the same way, slower. The detail I would add is minor and it is already implied above.

Dr.RaviCardio said:

The useful move here is to separate what is established from what is widely repeated.

Adding the part of the answer the thread has not reached. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.

One concrete data point for the thread. Worth stating the units and the reference range whenever you post a number here. A large fraction of the apparent disagreement in these threads is two people using different units and both being right.

Moderator note: the sourcing question belongs in the vendor section and has been split out. No action needed from anybody.