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South African sprinter Carina Horn has been provisionally suspended by the Athletics Integrity Unit (AIU) for the presence of a prohibited substance in violation of the anti-doping rules.

Apparently there was a presence of Ibutamoren and LGD-4033 in her system.

Ibutamoren apparently causes the secretion of a number of hormones including growth hormone and insulin-like growth factor 1. LGD-4033 is known for its muscle mass increasing properties.

The 30-year-old has run as fast as 10.98 (+1.5 wind) over 100-metres, which is a national record and 23.43 over 200m and 41.12 over 400m. She is a six-time national champion. She is also on the RSA 4 x 100m relay team which won gold at the 2016 Durban African Championships

The mandatory provisional suspension has been handed down for now, until a final decision at a hearing is conducted under the International Association of Athletics Federations (IAAF) Anti-Doping Rules or the AIU.