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The level of heavy metals and trace elements such as Li, Ag, Pd, Ti, Co, Ni, As, Sn and so on, in hair has been proposed as biomarkers of lung cancer 51

Catania S, Gobbo F, Bilato D, Gagliazzo L, Moronato ML, Terregino C, Bradbury JM, Ramrez AS (2016) Two strains of Mycoplasma synoviae from chicken flocks on the same layer farm differ in their ability to produce eggshell apex abnormality

However, you might be aware of Mo Farah having been questioned over his L-Carnitine supplementation before the 2014 London Marathon

SUPPORTING CARDIOVASCULAR AND MUSCLE HEALTH L-Carnitine is closely linked to cardiovascular and muscle health