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Much of the evidence remains anecdotal or derived from animal studies, emphasizing the importance of caution and professional guidance

Birben EE, Sahiner UM, Sackesen C, Erzurum S, Kalayci O (2012) Oxidative stress and antioxidant defense

Here is why we do not use those sources, and why you should not either

The knees are flexed slightly during the setup phase of the deadlift, and therefore recruitment and contraction of the quadriceps are also required during the deadlift to properly extend the knee
