First of all, the role of BCAA in publicity did not increase fat oxidation, and there was no experiment to show this effect. HMB

Some animal experiments think that it has a certain fat-reducing effect, but only one human experiment I know reports that HMB has this effect, and most experiments can't replicate the effect of animal experiments.

HMB is better if you want to use it. At least there are more effective experimental reports on strength gain and lean body weight gain. The sports supplementary plan of Australian Institute of Physical Education puts HMB in Group B and BCAA in Group C, which can still explain some problems.