I wrote a review several years ago and am writing again to tell those of you who are reading these reviews trying to decide whether to purchase it. I take it because I have hypomagnesemia, caused by intense max chemo and radiation 39 yrs ago. When the L-threonate form was released I was so hopeful because I knew I wasn't getting the brain help I needed to avoid the damage of the hypomagnesemia as I aged, and the laxative effect of the other forms of magnesium I had to take all these years. I am a medical survival miracle, seriously, going to be 75 and with late stage ovca, was given 5 yr max prognosis. I was a 35 working mom. I haven't had a choice but to be proactive about my responsibilities and provide my body with everything I could to withstand the cancer treatments with "minimal" damage. My brain function showed improvement around 2 weeks and definitely has continued which is hugely awesome!!!! My stomach is totally normal. I recommend taking just 1 in day, the remaining 2 in the evening, so you don't fall asleep at your zoom meetings. This stuff is important for arrhythmia, stress anxiety, insomnia, aging brain, aches, joints. I have transplant and the anti rejection meds can give senior recipients a difficult type of diabetes right away, one day in my case, and not curable. It definitely helps neuropathy. I use Sparkpeople to micromanage, plan and track my food through the day to meet nutritional requirements. It's a challenge to get a minimum of 90g protein daily with a well balanced menu of food groups. Lol, I've been called most proactive patient, miracle case, etc., by top doctors over past 40 years. I did medical library research on my job back then in 1981, exec asst to ivy league medical center dept chairman before we had computers(!). I got hospital chart, photocopied all of it and started reading in the medical library. Stage 3, scary battle ahead for single parent. Wow, my news feed nowadays is more than I can or want to keep with. Amazon keeps me in supplements and art supplies! I rely on it for supplements difficult to get elsewhere. Lately, with slowed deliveries, it's scary if my subscribe and save orders get delayed. Amazon needs to help high risk disabled customers in long term self isolation quarantine by setting up with system supporting their loyalty and reliance