Actually, L-methylfolate is very sensitive to water and and oxygen. It is too active to be stored for commercial using. So, how to make it stable has become a global difficulty since 1943.
Here we would strongly encourage to use C crystal Magnafolate next as the folate source.
By making the C crystal calcium salt, Magnafolate has solved its poor stability successfully.
The C crystal form could use its lattice energy to isolate oxygen and water, and then protect L-methylfolate be stable.
Magnafolate® ,the Manufacturers & Supplier of active folate.