{"id":378240,"date":"2026-03-10T20:18:11","date_gmt":"2026-03-10T20:18:11","guid":{"rendered":"https:\/\/www.europesays.com\/ie\/378240\/"},"modified":"2026-03-10T20:18:11","modified_gmt":"2026-03-10T20:18:11","slug":"5-supplements-you-should-never-take-together-2","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/ie\/378240\/","title":{"rendered":"5 Supplements You Should Never Take Together"},"content":{"rendered":"<p><strong>Medically reviewed by Femi Aremu, PharmD<\/strong><\/p>\n<p><img alt=\"Taking certain supplements together may trigger negative effects.Credit: Oleg Breslavtsev \/ Getty Image\" loading=\"lazy\" width=\"1242\" height=\"828\" decoding=\"async\" data-nimg=\"1\" class=\"standard-img w-full w-full h-auto\" style=\"color:transparent\" src=\"https:\/\/www.europesays.com\/ie\/wp-content\/uploads\/2026\/03\/e9fc1606ac70e32617af8f1099625e78.jpeg\"\/><\/p>\n<p>Taking certain supplements together may trigger negative effects.<br \/>Credit: Oleg Breslavtsev \/ Getty Image<\/p>\n<ul class=\"content-list\">\n<li>\n<p>Certain supplements can interfere with each other\u2019s absorption or effectiveness when taken together.<\/p>\n<\/li>\n<li>\n<p>Mixing supplements with similar effects can raise the risk of side effects or health complications.<\/p>\n<\/li>\n<li>\n<p>To stay safe, space out doses, avoid excessive intake, and consult a healthcare professional before combining supplements.<\/p>\n<\/li>\n<\/ul>\n<p>Taking supplements can support your overall health, but timing and combinations matter. Certain pairings can reduce absorption or trigger side effects.<\/p>\n<p>1. Calcium and Iron<\/p>\n<p><strong>What happens:<\/strong> Taking <a href=\"https:\/\/www.health.com\/calcium-and-iron-8584942\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:calcium with other minerals like iron;elm:context_link;itc:0;sec:content-canvas\" class=\"link rapid-noclick-resp\">calcium with other minerals like iron<\/a> isn\u2019t a good idea.\u00a0\u201cBoth calcium and zinc can block the absorption of iron supplements because they compete for absorption in the intestines,\u201d <a href=\"https:\/\/joinmochi.com\/blog-authors\/jennifer-warren\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:Jennifer Warren, MD, DABOM, DABFM;elm:context_link;itc:0;sec:content-canvas\" class=\"link rapid-noclick-resp\">Jennifer Warren, MD, DABOM, DABFM<\/a>, medical director at Mochi Health, told Health. \u201cThis is especially important for people who have an iron deficiency who need extra iron to improve anemia,\u201d she said.<\/p>\n<p><strong>Why it matters:<\/strong> Since iron and calcium compete for absorption in the digestive tracts, taking them together can lower their effectiveness by reducing the amount of these nutrients your body absorbs.<\/p>\n<p><strong>What to do instead:<\/strong> \u201cTo ensure the best absorption, take iron by itself in the morning with either water or citrus juice, since vitamin C can assist iron absorption, and avoid other mineral supplements for at least two hours,\u201d recommended Warren. If <a href=\"https:\/\/www.health.com\/can-iron-cause-constipation-11681278\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:iron supplements make you nauseated;elm:context_link;itc:0;sec:content-canvas\" class=\"link rapid-noclick-resp\">iron supplements make you nauseated<\/a> when taken on an empty stomach, you can take them with a small amount of food. Calcium should also be taken on its own to optimize absorption.<\/p>\n<p>2. Calcium and Zinc<\/p>\n<p><strong>What happens:<\/strong> Like iron, calcium competes for absorption with other minerals, like <a class=\"link rapid-noclick-resp\" href=\"https:\/\/www.health.com\/benefits-of-zinc-supplements-11867032\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:zinc;elm:context_link;itc:0;sec:content-canvas\">zinc<\/a>.\u00a0\u201cCalcium and zinc will compete for absorption in the gut, so taking them together can reduce how much you absorb of each,\u201d\u00a0<a href=\"https:\/\/scholars.uab.edu\/3282-charitharth-lal\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:C. Vivek Lal, M.D.;elm:context_link;itc:0;sec:content-canvas\" class=\"link rapid-noclick-resp\">C. Vivek Lal, M.D.<\/a>, director of clinical innovation at Heersink Institute of Biomedical Innovation at the University of Alabama at Birmingham, told Health.<\/p>\n<p><strong>Why it matters:<\/strong> \u201cZinc supports immune function and healing, while calcium helps fill dietary gaps to meet daily needs for bone health,\u201d explained Lal. \u201cPoor uptake from nutrient competition impacts these benefits,\u201d he said.<\/p>\n<p><strong>What to do instead:<\/strong> \u201cA simple routine is to take calcium supplements with meals, and to take zinc away from calcium-rich meals or supplements,\u201d said Lal. It should be noted that while certain forms of calcium, like calcium citrate, can be taken with or without food, other forms, like calcium carbonate, should be taken with meals.<\/p>\n<p>3. Zinc and Copper<\/p>\n<p><strong>What happens:<\/strong> <a href=\"https:\/\/www.health.com\/copper-zinc-supplements-together-7970206\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:Copper and zinc;elm:context_link;itc:0;sec:content-canvas\" class=\"link rapid-noclick-resp\">Copper and zinc<\/a> compete for absorption in your small intestine. \u201cThese minerals compete for absorption as they share similar transporters in their absorption pathways,\u201d <a href=\"https:\/\/dietredefined.com\/\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:Helen Tieu;elm:context_link;itc:0;sec:content-canvas\" class=\"link rapid-noclick-resp\">Helen Tieu<\/a>, RD, told Health.<\/p>\n<p><strong>Why it matters:<\/strong> While copper and zinc compete for absorption, research suggests that issues typically stem from taking very high doses of zinc. Studies show that long-term intake of 60 milligrams or more of zinc per day can impair copper absorption and reduce blood copper levels. Copper deficiency can cause health issues such as anemia and muscle weakness.\u00a0It&#8217;s important to stay below the Tolerable Upper Intake Level (UL) for zinc, which is set at 40 milligrams per day for adults.<\/p>\n<p><strong>What to do instead: <\/strong>\u00a0\u201cSpace the dosing of these minerals throughout the day, or opt for a balanced mineral or multivitamin supplement that contains lower doses of zinc and copper,\u201d recommended Tieu.<\/p>\n<p>4. Fish Oil and Ginkgo Biloba<\/p>\n<p><strong>What happens:<\/strong> Platelets are small blood cells that help your blood clot to prevent bleeding.\u00a0\u201cGinkgo biloba and high-dose fish oil both inhibit platelet function, so taking them together can raise bleeding risk due to thinning of the blood,\u201d explained Lal. This is especially important for people taking blood-thinning medications, like Warfarin. \u201cThe same caution applies to other blood-thinning supplements like garlic, ginger, turmeric, and ginseng,&#8221; he said.<\/p>\n<p><strong>Why it matters:<\/strong> Taking high doses of supplements that have blood-thinning properties can be dangerous, especially for people already on blood thinners. It\u2019s also not a good idea to take blood-thinning supplements before a scheduled surgery, as this could increase bleeding risk.<\/p>\n<p><strong>What to do instead:<\/strong> To keep yourself safe, Lal recommended avoiding stacking these supplements, considering lower or alternate dosing, and reviewing your regimen with your doctor, especially prior to any surgical procedure.<\/p>\n<p>5. Activated Charcoal with Any Nutrient<\/p>\n<p><strong>What happens:<\/strong> <a href=\"https:\/\/www.health.com\/activated-charcoal-7969599\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:Activated charcoal is a popular natural remedy;elm:context_link;itc:0;sec:content-canvas\" class=\"link rapid-noclick-resp\">Activated charcoal is a popular natural remedy<\/a> for digestive ailments, such as bloating, as well as for eliminating toxins from the body. However, activated charcoal should not be taken with vitamins and mineral supplements. &#8220;Activated charcoal will bind to minerals and vitamins, therefore impacting absorption,\u201d Lal said.<\/p>\n<p><strong>Why it matters:<\/strong> Taking activated charcoal for prolonged periods can prevent the absorption of essential nutrients, leading to deficiencies and health issues. It can also interfere with medication absorption, reducing their effectiveness, which can be dangerous.<\/p>\n<p><strong>What to do instead:<\/strong> Lal recommended using binders like activated charcoal in short, targeted doses and separating them from all medications and supplements for 2 to 4 hours.<\/p>\n<p>Why Supplement Combinations Matter<\/p>\n<p>Dietary supplements may seem harmless, but taking too much of certain supplements or misusing them can result in reduced nutrient absorption and other serious side effects.<\/p>\n<p>\u201cIt\u2019s important to consider supplement interactions since many share absorption pathways and alter enzymes that process and clear medications,\u201c explained Warren. \u201cThese interactions can lead to dangerous complications, including failure of effectiveness of medications, nutritional deficiencies, and other side effects.\u201d<\/p>\n<p>Warren advises speaking with your medical provider if you\u2019re unsure of a specific supplement combination or have questions about supplement safety.<\/p>\n<p>How to Take Supplements Safely<\/p>\n<p>Here are a few tips to help you stay safe when taking supplements:<\/p>\n<ul class=\"content-list\">\n<li>\n<p><strong>Space them out:<\/strong> Take competing nutrients a few hours apart. For example, take iron in the morning and calcium later in the day.<\/p>\n<\/li>\n<li>\n<p><strong>Avoid large doses:<\/strong> Unless specifically recommended by a healthcare provider, it&#8217;s best to stay below the established upper limits (ULs) for vitamins and minerals to prevent excessive intake, which may deplete other vital nutrients in some cases.<\/p>\n<\/li>\n<li>\n<p><strong>Pair wisely:<\/strong> Some supplement combinations help absorption, like vitamin C and iron, while others, like calcium and iron, hinder absorption.<\/p>\n<\/li>\n<li>\n<p><strong>Talk with your healthcare provider:<\/strong> If you have questions or need advice on supplements, speak with a trusted healthcare provider.<\/p>\n<\/li>\n<\/ul>\n<p>Read the original article on <a href=\"https:\/\/www.health.com\/supplements-you-should-never-take-together-11923110\" rel=\"nofollow noopener\" target=\"_blank\" data-ylk=\"slk:Health;elm:context_link;itc:0;sec:content-canvas\" class=\"link rapid-noclick-resp\">Health<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Medically reviewed by Femi Aremu, PharmD Taking certain supplements together may trigger negative effects.Credit: Oleg Breslavtsev \/ Getty&hellip;\n","protected":false},"author":2,"featured_media":378241,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[277],"tags":[174033,18,135,19,17,143838,88031,174031,508,7886,3013,174032],"class_list":["post-378240","post","type-post","status-publish","format-standard","has-post-thumbnail","category-nutrition","tag-effectiveness","tag-eire","tag-health","tag-ie","tag-ireland","tag-iron-absorption","tag-iron-supplements","tag-jennifer-warren","tag-nutrition","tag-side-effects","tag-supplements","tag-vivek-lal"],"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ie\/116206731671501640","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/posts\/378240","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/comments?post=378240"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/posts\/378240\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/media\/378241"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/media?parent=378240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/categories?post=378240"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ie\/wp-json\/wp\/v2\/tags?post=378240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}