Yes, Noctua’s NT-H1 and NT-H2 thermal pastes are perfect for use in laptops or notebooks. Many applications use relatively low quality thermal grease, so the thermal interface between the heatsink and the CPU (and, if available, GPU) is not ideal. In these cases, replacing the original paste with a high quality compound like NT-H1 or NT-H2 can lead to significantly lower temperatures, which allows for more overclocking headroom or lower fan speeds and quieter operation. 

Whereas liquid metal based thermal compounds are electrically conductive and therefore risky to use in laptops because applying just slightly too much paste can result in short-circuits, NT-H1 and NT-H2 are not electrically conductive and therefore 100% safe to apply in laptops even if too much paste is being used and the paste makes contact with other components. 

As most notebook processors don’t have integrated heat-spreaders (IHS), the paste is applied directly to the small CPU DIE, so only a minimal amount of paste (a drop of around 1-2 mm size) is required.