difference beteen acety carnitine and l-carnittine The Between L-Carnitine & Acetyl L-Carnitine – Swanson Vitamins making it an ideal choice for individuals looking to enhance endurance and improve recovery time Acetylcarnitine - Wikipedia
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J., Eliaz, I
However, more significant benefits, particularly those related to cardiovascular health and brain function, typically require consistent supplementation for 8-12 weeks or longer

Doctors warn that this is not safe
10.1136/gutjnl-2015-309389 25 HeC.YuT.ShiY.MaC.YangW.FangL.et al (2017a)
Though theres a long list of dos and donts when it comes to hydroquinone, when applied properly, it has been proven to decrease the appearance of hyperpigmentation

doi: 10.1128/iai.63.6.2262-2268.1995