Name the active ingredient, not just the brand. It makes these threads searchable years later.

This is the kind of post the forum exists for. Same for me with vitamin B12, unfortunately.

Photograph everything before you open it. Ten seconds, settles most disputes.

Same here.

Worth repeating that this is not medical advice and the answer often depends on who you are.

Loose evidence and no evidence are different, and people overcorrect in both directions.

I would stop trying to convey how bad it is and start saying what you want them to do.

Test one thing at a time. It feels slower and it is the only way to learn anything.

Read methods.

Name the active ingredient, not just the brand. It makes these threads searchable years later.