IS hydroxypropyl methylcellulose safe to use in dietary supplement pills

Regarding Hyroxypropylmethtlcellullose (HPMC) capsules. Coded: E464. At the age of 70 I am pleased (not proud) with my physical and mental fitness, and had never experienced a digestive problem untill my recent experience with HPMC or E464. I want to share my experience because there is important learning within it. It began like this: A friend of mine, a molecular biologist, tipped me off about the need and the defict of vitamin 43 (FORGET D2, thats rubbish). So, for the first time in my life, I began to take a supplement; in this case Vit.D3. After taking the capsules for roughly 10 days I sterted to experience intense abdominal wind and bloating; which persisted for at least another 10 days. Then, thinking I had an infection, or that somthing toxic had entered my stomach; Idecided to take Echinacea herb 'HPMC' capsules; and, to avoid complicating matters, I stopped taking theVit.D3. The wind and bloating continued unabated for about 10 days or so, when I stopped taking the Echinacea capsules too. Within a week my digestive problem had gone. Later on I became convinced that my body needed help to detox itself; so I began taking dandilion root (herb) 'HPMC' capsules; and ,within a few days the intense abdominal wind and bloating returned; making it clear to me that the HPMC (E464) capsules themselves were the cause. I urge all readers to be pro-active in defence of their health; and to look deeply into the (very freaky) affects of E464.