What can I do if the use of hard gelatin capsules (gel or gelules) cracks

Cracking and cracking of gelules or hard gelatin capsules may have to do with the moisture content of the capsules. These should be kept in good atmospheric conditions   (relative humidity) in order to preserve their supeliness.  

A first precaution is capsules wrapped in plastic packaging purchases.  

A second solution is to re-establish the moisture content. After all, the consumption of capsules in the Officinas has decreased lately. This has its consequences on the turnover and consequently the capsules remain stored at different levels for a long time. And this storage does not always happen in optimal conditions. The water content for gelatine capsules is between 13 and 16%   (loss on drying) and between 5 and 7% for capsules made from Hypromellose.   Following graph shows the moisture content in function of the humidity .

http://www.qualenica.be/vraagbox/wat-kan-de-reden-zijn-waarom-harde-gelatine-capsules-gevuld-met-aspirine-barsten-wanneer

Therefore, it may be advisable to acclamize the capsules for use in A damp room. You can use a large cooking pot with a lid that covers the soil with water. In this large pot you place a smaller one with the bottom facing upwards and on this soil you place a container in which you transfer the capsules to be used. After closing the large cooking pot with the lid, leave this setup for 24 hours. I suspect that after this period the capsules will have reached their equilibrium moisture content.

It also pays to bother HPMC capsules, which have a lower water content, Test. These are available under the name Vcaps or DRcaps.