LTF and Parkinson disease: GO’s ability to reach the brain makes it also a good candidate for neurological applications [15,91,92], as reported, for example, by Xiong et al. [91], who developed a DDS to treat Parkinson’s disease (PD) using lactoferrin (Lf)-functionalized GO as a nanocarrier for the natural drug puerarin (Pue), which presents anti-PD properties (Lf-GO-Pue).