Least regularity of boundary to have Lipschitz or bounded mean curvature?

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For domains of class $C^{1,1}$, I know that the mean curvature of its boundary belongs to $L^{\infty}(\partial \Omega)$. Is $C^{1,1}$ regularity the least regularity needed for the mean curvature to be in $L^{\infty}(\partial \Omega)$? How about the conditions on the boundary of a domain to have bounded mean curvatures? Which references discusses this kind of topic?