Just echoing the above posts really, but im raw vegan and deadlifting 150kg for 5 without a belt. Form and technique are most important, just make sure you keep working on them, even when you think you have it. The majority of injuries occur from consistant repetitive poor technique causing wear and tear till something just goes. The most I use is chalk and if im feeling unsure about my body one day I'll start out lighter and build up feeling the effect the increase is having on my body and how its being displaced through the body based on my technique. Hope that helps