Former Strikeforce champion Jake Shields has been issued a six-month suspension for a banned substance. Shields' representatives at Authentic Sports Management informed MMAjunkie.com of the suspension Friday.

In the statement, Shields admitted to using a banned substance and accepted the Colorado Department of Regulatory Agencies' Boxing Commission's punishment.

Shields defeated Ed Herman via decision in his return to the middleweight ranks after entering the UFC as a welterweight.

"This was a mistake that I fully regret," Shields' statement read. "I have shared this issue with my family and the UFC, and I have apologized to them and now I also apologize to you, the fans. I promise this will never occur again in my fighting career."

The statement did not include what the banned substance was. The information has not been added to the Colorado Department of Regulatory Agency's website yet.

Shields will be eligible to return to action in February. The suspension dates back to the test in question, which took place in August.

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