Cholecalciferol and Increased Heart Rate: What Users Say

• Rea...
• October 31, 2020

Cholecalciferol for Vitamin D Deficiency "Blood test showed that I am Vitamin D deficient, doctor and endo recommended me to take D3 1000 IU daily. After taking it, I noticed heart tightness, heart pounding, feeling weird in general. I stopped for a few days, then I was fine. I started taking it again today, immediately, my heart felt funny again."

• Lee...
• September 7, 2019

Cholecalciferol for Vitamin D Deficiency "So my doc prescribed me 10000 IU for 6 weeks, since I was vitamin D deficient. After 2 weeks of taking these, I noticed terrible heart palpitations and a fast heartbeat. I went to the ER with a heart rate of 172, the scariest day of my life. Vitamin D makes me so drowsy and dizzy. I'm definitely not taking this anymore. It helped me with my levels, now it is 36, but it's making me feel miserable."

• Eri...
• Taken for less than 1 month
• August 22, 2021

For Vitamin D Deficiency "I was advised to take 2,000 IUs of cholecalciferol daily after being diagnosed with a vitamin D deficiency. About 6 hours after my first pill, I noticed my heart was racing, and I started having palpitations. Then the anxiety set in. At this point, I didn’t make the connection with the cholecalciferol, but after continuing to take it over the following days, the anxiety turned to absolute sweaty panic and dread, as well as insomnia. By day 4, I was horribly depressed, had no appetite, and was nauseous. I don’t think my doctor believed me when I told her the cholecalciferol was causing this, but I know that’s what it was. I later learned that cholecalciferol creates serotonin in your brain by increasing the enzyme tryptophan hydroxylase 2. If you get too much serotonin, you develop serotonin syndrome - and my experience aligned exactly with the symptoms of serotonin syndrome. Hopefully, this is helpful to others. For now, I’ll just keep my vitamin D deficiency."

• Anonymous
• November 20, 2019

For Vitamin D Deficiency "My vitamin D levels are 15, so my doctor prescribed 50,000 units once per week. After taking it, I felt very strange. Within 2 days, my heart was pounding out of my chest, I could not sit still, I was literally out of breath. I was so scared, I called my doctor's office 3 times and explained what was happening. She said that I might have symptoms of a heart attack. I refused and took my when required Klonopin. Soon I was feeling so much better. I was so scared I thought I was going to die! Dangerous stuff when taking very high doses. Your body can only absorb so much at a time! I feel for anyone going through this. Don't know how I'm going to get my levels up after what happened. God bless."

• Anonymous
• Taken for less than 1 month
• August 29, 2021

Cholecalciferol for Vitamin D Deficiency "I had low vitamin D. My doctor put me on 50,000 IU/week. After the first dose, I have been to the ER twice. Dizzy, lightheaded, real high, anxiety, massive headaches, twitchy, coordination loss, high heart rate, photo and audio oversensitivity, mental confusion, spinning, eye pressure, 'pre-dreaming,' just shutting my eyes. I have to avoid light, sounds, movement. I make myself eat 'cause nausea and weight loss. Doctors dismiss it, but I have read about serotonin and other levels being too high. I regret taking this and currently waiting for my body to be deficient again just so I can feel OK. First 15 hours bad. Doctor said 2-3 days, but it's been my 6th day. Read after 15 days, vitamin D is down to 50%. 25% by 30 days. I avoid light, any vitamin D foods, anything to cause serotonin levels to go up. I was better off in my level mental state. Hope this may help calm you if you are having effects."

• Ano...
• October 12, 2021

For Vitamin D Deficiency "I was told to take vitamin D for a deficiency. Started 2500 IU per day. Realized within a week my heart was pounding and decided to check my blood pressure. Was shocked to see it was at 165/90. Usual is 120-80 to 130/80. I exercise daily, eat sensibly, and am not overweight. Am stopping vitamin D immediately, as I have read that some people react badly to it. We’re all different, so why do doctors insist that supplements cannot cause these types of issues? I have also reacted badly to K2 in the past and no longer take it."