The cliche about HR doesn't mean that HR can't ever be helpful to you, just that they are incentivized to be helpful in ways that help the company. For example advising on how to best use benefits to keep employees healthy or recover from an illness or injury so they can return to work.

But if your needs as an employee go against what is best for the company by costing money, productivity, or creating risk for bad publicity, or they go against high level managers or executives who hold outsized sway with HR, then it will be difficult for you to get help from them.