Lifestyle

Optimizing Your Sleep: Vitamins and Supplements to Avoid (and Embrace) Before Bed

Published

1 year ago

August 19, 2025

We all know the importance of a good night’s sleep. But did you know that the timing of your vitamin and supplement intake can significantly impact your sleep quality? Popping certain pills before bed might be the reason you’re tossing and turning. Let’s dive into which vitamins and supplements to avoid before bedtime, and which ones may actually promote restful sleep, according to dietitians.

Supplements to Avoid Before Bedtime

To preserve your sleep hygiene, reconsider taking these supplements before you hit the hay:

Vitamin B12: B vitamins, especially B12, are involved in energy production and neurological function. Taking them in the evening can be disruptive. Studies have linked both low and high levels of B12 to insomnia. Aim for the recommended 2.4 mcg daily in the morning.
Calcium: Taking calcium before bed can interfere with magnesium absorption, a mineral crucial for sleep. Stick to the recommended daily value of 1000 mg (1200 mg for adults over 51) earlier in the day, or obtain calcium through dietary sources like milk, which may enhance sleep quality.
Multivitamins: Since multivitamins often contain B vitamins and calcium, it’s best to avoid them at night. Plus, many contain fat-soluble vitamins that absorb best with a meal, not right before bed. If you need a multivitamin, take it with breakfast or lunch.

Supplements That Promote Sleep

While some supplements can hinder sleep, others can be beneficial:

Magnesium: This vital mineral supports sleep by regulating neurotransmitters involved in relaxation. A 2024 study found that magnesium threonate, taken two hours before bed, improved sleep quality, mood, energy, and productivity. Dietitians recommend 200-400mg of magnesium glycinate or citrate after dinner.
Vitamin C: Research indicates that higher levels of vitamin C are associated with better sleep. A daily intake of 132 to 191 mg can help prevent sleep disorders.
Iron: If you’re iron-deficient, supplementing daily to ensure your levels are within the normal range may help improve sleep.
Omega-3 Fatty Acids: A 2024 study showed that higher omega-3 intake led to greater sleep efficiency. These fatty acids may support sleep by influencing serotonin secretion. Aim for at least 1.1 to 1.6 grams daily.

The Bottom Line

To optimize your sleep, prioritize magnesium before bedtime and take multivitamins with your morning meal. If you’re unsure about the best time to take a supplement, consult your healthcare provider or pharmacist. Striking the right balance with your supplements is key to nourishing your body and achieving high-quality sleep.

Related Topics:BetterSleepTips HealthySleepHabits SleepOptimization SleepSupplements

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