On the website they list trusted partners:
Hilmabiocare (just scroll down on the main page and you will find them)
Not all the partners are listed there, but if you email them asking for a specific seller not listed they can confirm whether it is or not. I find it strange they dont list all of them, so I would stick to the ones listed on the page, at least as a first filter.
There is also this thread on this forum by a distributor/reseller:
Hilma Biocare is a European scientific and research pharmaceutical and biotechnology company which cooperate with manufacturer in India and specializing in the development and manufacture of products , intended to improve the quality of life and bodybuilding results...
thinksteroids.com
In this thread he/they share different ways of contact, being very responsive and helpful:
Email:
hilmabc@protonmail.com
Telegram:
HilmaBiocareSupport
Wickr:
hilmabc