I wouldn't even begin to consider buying R-ALA from a direct supplier in China when I can get it from any number of reasonably reputable vendors. A number of well know supplement makers sell it in capsule form and Bulk Supplements sells it in powder form starting at 10g quantities and going up. If you want to make eye drops out of it, 10g is going to last you a long time. For eye drops I would definitely start with bulk powder as I assume that capsules are going to have fillers and excipients which you don't want in your eye.
To me, buying off Alibaba is a last resort.
It is hard to find 100% R-ALA. I have ordered some pure regular ALA from a UK supplement supplier. Do you know how easy it is to get Alpha-Lipoic Acid Choline Ester? I only found this https://www.medkoo.com/products/12288 but they are strict about only selling to serious researchers.
