But when researchers look at what happens when people take vitamin D supplements regularly<\/a>, the results are mixed. Some studies show a small benefit, while others show no change at all.\n<\/p>\n What seems most promising is that vitamin D might help lower blood pressure if you already have high blood pressure<\/a> and low vitamin D levels<\/a> to begin with. In these cases, the supplement may offer a small boost in managing blood pressure<\/a>. But even then, the blood pressure-lowering effect isn\u2019t guaranteed.\n<\/p>\n Older adults who are both low in vitamin D and have high blood pressure may benefit the most. For them, taking vitamin D may help improve blood pressure as part of an overall plan that includes a healthy diet, exercise<\/a>, and possibly medication.\n<\/p>\n How Much Vitamin D Should You Take? <\/p>\n There\u2019s no one-size-fits-all answer to how much vitamin D you should take to lower blood pressure. In research studies, the dose of vitamin D has ranged from 800 to 4,000 IU (international units) per day. Interestingly, higher doses don\u2019t always lead to better results for blood pressure.\n<\/p>\n Here are the general daily recommendations:\n<\/p>\n Infants (0\u201312 months): 400 IU per day Some people may need more, especially if they\u2019re at higher risk of vitamin D deficiency<\/a>. This includes people with limited sun exposure, darker skin, certain health conditions, or older age. Many experts recommend around 1,000\u20132,000 IU per day for these groups.\n<\/p>\n If you\u2019re unsure how much you need, talk to your doctor. They may order a simple blood test to check your vitamin D level.\n<\/p>\n Is It Safe to Take Vitamin D Every Day? <\/p>\n Most people can safely take vitamin D every day at the recommended amounts. But it is possible to take too much, especially if you\u2019re using high-dose supplements for a long time.\n<\/p>\n Taking too much vitamin D can lead to a condition called vitamin D toxicity<\/a>. This can cause high levels of calcium<\/a> in your blood, which may lead to:\n<\/p>\n Nausea or vomiting To avoid this, stick with the daily recommendation for your age, and don\u2019t exceed the safe upper limit of 4,000 IU per day unless your healthcare provider tells you otherwise.\n<\/p>\n Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process<\/a> to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.<\/p>\n Meng R, Radkhah N, Ghalichi F, et al. The impact of vitamin D supplementation on improving blood pressure: evidence obtained from an umbrella meta-analysis<\/a>. Clin Ther. 2023;45(10):e208-e216. doi:10.1016\/j.clinthera.2023.07.020<\/p>\n Jiang L, Sun YQ, Denos M, et al. Serum vitamin D, blood pressure and hypertension risk in the HUNT study using observational and Mendelian randomization approaches<\/a>. Sci Rep. 2024;14(1):14312. doi:10.1038\/s41598-024-64649-6<\/p>\n Chen S, Gemelga G, Yeghiazarians Y. Is vitamin D supplementation an effective treatment for hypertension?<\/a>. Curr Hypertens Rep. 2022;24(10):445-453. doi:10.1007\/s11906-022-01204-6<\/p>\n Jensen NS, Wehland M, Wise PM, Grimm D. Latest knowledge on the role of vitamin D in hypertension<\/a>. Int J Mol Sci. 2023;24(5):4679. doi:10.3390\/ijms24054679<\/p>\n Beveridge LA, Struthers AD, Khan F, et al. Effect of vitamin D supplementation on blood pressure: a systematic review and meta-analysis incorporating individual patient data<\/a>. JAMA Intern Med. 2015;175(5):745-754. doi:10.1001\/jamainternmed.2015.0237<\/p>\n Serra MO, de Macedo LR, Silva M, Lautner RQ. Effect of vitamin D supplementation on blood pressure in hypertensive individuals with hypovitaminosis D: a systematic review and meta-analysis<\/a>. J Hypertens. 2024;42(4):594-604. doi:10.1097\/HJH.0000000000003646<\/p>\n Abderhalden LA, Meyer S, Dawson-Hughes B, et al. Effect of daily 2000 IU versus 800 IU vitamin D on blood pressure among adults age 60 years and older: a randomized clinical trial<\/a>. Am J Clin Nutr. 2020;112(3):527-537. doi:10.1093\/ajcn\/nqaa145<\/p>\n National Institutes of Health Office of Dietary Supplements. Vitamin D<\/a>.<\/p>\n Demay MB, Pittas AG, Bikle DD, et al.\u00a0Vitamin D for the prevention of disease: an Endocrine Society clinical practice guideline<\/a>.\u00a0J Clin Endocrinol Metab. 2024;109(8):1907-1947. doi:10.1210\/clinem\/dgae290<\/p>\n
Children and adults (1\u201370 years): 600 IU per day
Adults over 70: 800 IU per day<\/p>\n
Fatigue or weakness
Confusion
Irregular heartbeat
Kidney problems in severe cases<\/p>\n
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