While many combinations are fine, the key vitamin pairing to avoid taking together is Vitamin C and Vitamin B12, as high-dose Vitamin C can reduce B12 absorption; also, avoid high-dose minerals like Iron and Calcium, or Iron and Zinc, as they compete for absorption, and Vitamin E and Vitamin K, as Vitamin E can interfere with Vitamin K's blood-clotting function. Spacing these supplements out by a few hours or taking them at different times of the day is generally recommended to prevent interactions.
What Vitamins Should You Avoid Taking Together?
What Vitamins Should You Not Take At Night? It may not be ideal to take vitamin D, B complex vitamins, and multivitamins at night. Research suggests vitamin D can interfere with the effects of melatonin and interrupt sleep. B complex vitamins may cause a boost in energy and cause sleep disruptions.
Taking zinc and magnesium together can sometimes irritate the stomach lining, leading to upset stomach or nausea. This reaction is often due to the minerals' effects on gastric acid and digestion. To reduce symptoms, try taking supplements with food or splitting doses throughout the day.
Absolutely! In fact, B12, Vitamin D, and Magnesium taken together may create synergistic effects and optimize the way they are all used by the body. Your body uses Vitamin D to absorb calcium. Along with calcium absorption, Vitamin D also has antioxidant and neuroprotective cellular functions.
If you're taking a magnesium supplement, let your prescriber know before starting these medications. Calcium and high doses of zinc may prevent your body from absorbing magnesium. Separating these supplements can help ensure you're getting the amount you need.
Warning signs of vitamin B12 deficiency include extreme fatigue, weakness, pale/yellow skin, numbness/tingling (pins and needles), cognitive issues (memory fog, confusion), mood changes (depression/irritability), and a sore, red tongue, alongside potential shortness of breath, heart palpitations, and balance problems, as symptoms develop slowly and can worsen over time. It's crucial to see a GP, as early treatment prevents potentially irreversible neurological damage, say NHS, Cleveland Clinic, and WebMD.
Your body needs magnesium to function normally. Symptoms of magnesium deficiency include low appetite, nausea or vomiting, muscle spasms or tremors and abnormal heart rhythms. A blood test or urine test can be used to diagnose magnesium deficiency.
You should only take the doses recommended on the product label or by your health care provider. Vitamins A, D, E and K are fat-soluble vitamins. That means they're stored in your liver and fatty tissue. If you take too much of them, you could experience vitamin toxicity, which could affect different organs.
Anecdotal evidence suggests that magnesium is best to take in the evening as it may help to improve sleep. Zinc can be taken at any time of day, although it may cause stomach upset in some people when taken on an empty stomach. If this is the case, avoid taking it late at night or before eating.
B Vitamins
Research has shown that maintaining sufficient levels of Vitamins B3, B5, B6, B9 and B12 may help achieve good sleep. The best food sources of vitamin B include whole grains, meat, eggs, seeds, and nuts, as well as dark leafy vegetables.
Vitamin D deficiency often has subtle or no symptoms but can cause fatigue, bone pain, muscle weakness/cramps, mood changes (depression), slow wound healing, frequent illness, and hair loss; in children, severe deficiency leads to rickets (bowed bones), while in adults, it increases risks for osteoporosis and fractures.
Vitamins B
All B vitamins play a role in converting food into energy and best known for this is vitamin B12. Vitamin B12 deficiency can cause exhaustion and feelings of sadness or anxiety. As our metabolism is boosted by B vitamins, this can have a stimulating effect and cause sleep problems if taken late at night.
Vitamin E — A 2012 review of research published in the Cochrane Database found that taking daily vitamin E supplements may increase the risk of dying prematurely. Vitamin A — The same review found large doses of vitamin A supplements were also associated with an increased risk of dying prematurely.
Iron and Zinc
These two essential vitamins share the same transport system in your gut. When they are taken in high doses together, they can compete with each other. It was found in a study that high doses of iron can significantly inhibit zinc absorption, especially when both are taken on an empty stomach.
Those that may affect blood pressure or blood pressure medicines include:
Vitamin toxicity happens when you take too much of a vitamin, leading to possible health problems. Fat-soluble vitamins like A, D, E, and K pose higher risks because they are stored in the body longer. Most B vitamins aren't toxic in high doses, but B3 and B6 can be if overused.
But routinely getting an overload of vitamins and minerals can hurt you. Too much vitamin C or zinc could cause nausea, diarrhea, and stomach cramps. Too much selenium could lead to hair loss, gastrointestinal upset, fatigue, and mild nerve damage.
Vitamins and Minerals That Work Well Together
Magnesium deficiency
Bananas are the richest fruit in magnesium. If eaten dried, its magnesium content is higher. More generally, dried fruits such as figs, dates and apricots are an important source of magnesium. Recipe idea: Try a banana-spinach smoothie.
If you're not sure where to begin, magnesium glycinate is an excellent place to start for sleep and anxiety. For sharper thinking or brain-based anxiety, try magnesium L-threonate. And for calming both your mind and body, magnesium taurate offers a gentle, heart-centered approach.
B12 deficiency can trigger specific food cravings, most notably for meat, fish, or eggs, as the body seeks animal-based sources to replenish the vitamin, especially in those on vegetarian/vegan diets or older adults. While cravings for sugary or salty foods can also signal general B-vitamin issues, the distinct urge for protein-rich animal products is a key indicator, but professional testing is crucial for confirmation.
The Boots Vitamin B12 Blood Test Kit checks your vitamin B12 levels, using a finger-prick blood sample. Use of this kit requires internet access. All personal data in relation to this product, services and online platforms are collected and processed by MyHealthChecked.
People need vitamin B-12 for the brain to work well. If not treated, vitamin B-12 deficiency can lead to issues with the nerves, brain or spinal cord. These might include lasting tingling in the hands and feet or trouble with balance.