Hello. For many years now my main problem is a strong weakness in the body and chronic fatigue. Therefore, I cannot work either physically or mentally. It was only recently that I found this forum and tried eggshell calcium. Immediately on the second day, I noticed tremendous improvements in strength, energy, endurance, cognitive abilities and mood, self-confidence (even the tone of voice becomes lower, rougher). Before that, I tried a bunch of vitamins (even in injections) macro, microelements, playing with testosterone injections. adrenal and thyroid hormones and much more. And only calcium gives the result. Only works with Hcl, without Hcl it doesn't work. I have hydrochloric acid liquid, I add drops to water and drink through a straw after calcium and food. I bought calcium gluconate at the pharmacy and it does not work at all. Not believing in this happiness, I took a break to check whether it really affects calcium. And yes, the very next day is really much better for me. I didn’t do a blood calcium test. But there is parathyroid hormone and it is low - 22.98 pg / ml. reference 15.0 -65.0. I do not understand anything. If I did not have enough calcium, then the ptg should be raised, but it is low. (I write with the help of Google translator)