Mixtures of alcohols such as [ethanol+glycerol] mixtures can be used as source of reducing agents for the room temperature synthesis of stable surfactant-free Au NPs in alkaline aqueous media. Based on evidence from UV-vis characterization and STEM microscopy, a benefit of this approach is that even small amount of glycerol around 2 v.% for a total amount of alcohol around 20 v.% improves the size control over the Au NPs towards lower sizes by favoring a faster nucleation. The overall strategies presented here could gain to be extended to alternative polyols such as ethylene glycol and mono-alcohol such as methanol. This strategy opens opportunity for the development of more robust and yet simple more sustainable and tractable synthetic strategies of size controlled Au NPs.