US$ 22.08
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PMID 18391970

Zhao X, Nicholls JM, Chen YG

Studies on 108 herb species have revealed the presence of melatonin in concentrations ranging from a few to several thousand nanograms per gram of tissue, meaning they are potentially good natural sources of this molecule (Salehi et al., 2019b)

Marek Diagnostics offers three lab panel tiers: Base (65+ biomarkers, ~$350), Comprehensive (80+ biomarkers, ~$500), and Complete (100+ biomarkers, ~$700)

Lichter-Konecki U, Mangin JM, Gordish-Dressman H, Hoffman EP, Gallo V
