The speaker was taking a test to reveal high levels of mercury in their blood. The speaker limited their Tuna consumption, ate more leafy greens, and supplemented with NAC to reduce mercury levels.
"The speaker on the podcast mentioned using N-Acetyl Cysteine (NAC) as a supplement to support glutathione production and detoxification to reduce mercury levels, after they learned from a Function health test that they had high levels of mercury in their blood. A listener may want to buy this to detoxify."