Taking vitamins and supplements at night can disrupt sleep patterns if the wrong nutrients are consumed before bed, according to health experts. While winding down with a supplement routine feels convenient, dietitians warn that certain compounds interfere with rest or require dietary fat for proper absorption.
Vitamin B12 and Energy Production Before Bed
Vitamins tied to energy production and neurological function, such as B12, should be avoided at night. Hannah Holzum, founder of Wholesome Nutrition Co., explains that B vitamins are better suited for the start of the day. Studies link both low levels and elevated amounts of vitamin B12 to insomnia. The NHS advises that individuals with a diet-related deficiency take 50 to 150 micrograms, while those with non-dietary deficiencies take one or two 1,000 microgram tablets daily if injections are not an option.
Why Calcium Disrupts Sleep Architecture
Calcium acts as another supplement to skip right before sleep. Consuming calcium at night can negatively affect the absorption of magnesium, a mineral that supports relaxation and rest. However, calcium deficiency also disrupts shut-eye. The NHS recommends a daily value of around 700mg. Researchers suggest consuming calcium through dairy sources like milk, which may enhance sleep quality.
The Multivitamin Trap at Night
Multivitamins typically combine calcium and B vitamins, making them a poor choice for a bedtime routine. Holzum points out that most multivitamins also contain fat-soluble vitamins that require dietary fat for optimal absorption, meaning they work best when taken with a meal. While not everyone needs a daily multivitamin if they maintain a balanced diet, they remain beneficial for pregnant and lactating women, individuals trying to conceive, older adults with low appetites, and people with malabsorption issues.
Supplements That Actually Improve Sleep
Certain supplements actively support rest when timed correctly. Magnesium stands out as a primary nighttime option. A 2024 study on magnesium threonate found that taking the supplement two hours before bed improved sleep quality, deep sleep, mood, and daily alertness. The NHS recommends an average daily intake of 270mg for adult women. Amy Anderson, founder of A+ Nutrition, recommends forms like magnesium glycinate or citrate in doses between 200 and 400mg after dinner or before bed, noting that she often mixes magnesium glycinate powder with water and tart cherry juice.
Additional research highlights vitamin C, with a 2024 study linking higher serum levels to better sleep, and iron, which helps individuals with iron deficiencies reclaim normal sleep patterns. A 2024 study reports that higher polyunsaturated omega-3 intake improves sleep efficiency by helping regulate serotonin secretion.
Pro Tip: If you take a daily multivitamin to support your nutritional health, take it with your morning meal rather than at night to prevent sleep disruption and enhance nutrient absorption.
Frequently Asked Questions
Is it safe to take magnesium every night?
Yes, dietitians often recommend well-tolerated forms of magnesium like glycinate or citrate in doses between 200 and 400mg after dinner or before bed to support relaxation.
Why do fat-soluble vitamins need to be taken with meals?
Fat-soluble vitamins require dietary fat present in a meal to be properly absorbed by the body, which is why taking multivitamins right before bed is discouraged.
What is the best way to improve sleep if supplements do not work?
Experts suggest cutting back on caffeine, sticking to a strict sleep schedule, and using white, brown, or pink noise to help improve rest.
Join the Conversation
Do you take your supplements in the morning or at night? Let us know your routine in the comments below, and explore our other health and wellbeing articles for more expert tips.
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