Figure 1.

Limonene breath profile in healthy subjects before and after oral administration. (A) Breath limonene levels in 3 healthy subjects measured in triplicate after ≥10 h fasting and compared to ambient. (B) Breath limonene levels measured before and after oral administration at the indicated time points. Limonene ingestion induces a spike in breath after 30 min followed by a progressive reduction toward baseline levels. (C,D) Spectral features showing a limonene washout-like time course, which could be potential bioproducts (Pot. Biop.). A.U. = arbitrary units.