It may sound gross, but donating what you'd normally flush down the toilet can provide a welcome boost for someone else's microbiome.
You'll have to keep your head tilted down six degrees at all times while you lay there, even when you're washing, eating, and using the toilet.
And this can cause you to be disqualified when staff at the center check your iron and hemoglobin levels.
Not everyone is comfortable with that.
Paid psychological studies, such as those that examine human behavior and brain function, may not generate as high of a return as clinical trials, but they are generally lower risk and require a shorter time commitment.
Not only is a hydrated donor able to donate faster, he or she also recovers more quickly and easily after donating plasma.
Proof of address can be what's on your photo ID.
When I performed the web search, I found two different centers in my city that pay for plasma donations.