just read the warning at the bottom of https://renapur.com/motorcyclists/ for certain types or colours of leather - same applies to all products named above
I use it on boots, although not on my Altbergs on which I use their Ledergris. I also use it on my leather jackets, my leather bike seat and I've also used it on gloves although I tend to use Nikwax Glove Proof on those.
One problem with leather food is all the old wives tales. Several issues are allegedly associated with neatsfoot oil (it damages stitching; it conditions leather in the short-term but speeds up its breakdown in the long term). I have no clue how many of these negatives are myths!
I do, however, trust Hideout and BKS for leather advice. So, it's Gold Label Hide Food or Duckswax for me. I find Duckswax is fractionally better at adding some water repellency, but there's not much between the two.
I haven't found a decent leather cleaner to use before the 'hide food'. Hideout recommended – and so I've stuck with – warm water and a clean cloth. Previously, I'd tried Nikwax Leather Cleaner because it seemed sufficiently gentle; but it appeared to remove very little dirt!