Can I take Vitamin B complex and Vitamin D together?

Why this happens

Vitamin B complex (which includes B1, B2, B3, B5, B6, B7, B9, and B12) and Vitamin D use different pathways for absorption and metabolism. Vitamin B complex consists of water-soluble vitamins, while Vitamin D is fat-soluble. They do not compete for the same receptors or interfere with each other's effectiveness.

What you should do

It is safe to take Vitamin B complex and Vitamin D at the same time. To help your body absorb the Vitamin D better, it is best to take it with a meal that contains some fat (such as yoghurt, eggs, or avocado). Always follow the dosage instructions on the packaging or those provided by your healthcare professional.

Important precautions

Hypercalcaemia (high blood calcium)

Do not take vitamin D if you have high levels of calcium in your blood or urine, as it can lead to kidney damage or heart rhythm problems.

Kidney stones or severe kidney disease

Use with caution; vitamin D increases calcium absorption which can worsen kidney stones or lead to calcium deposits in the kidneys.

Food and drink warnings

Alcohol

It is best to avoid or strictly limit alcohol when taking Vitamin B complex. Alcohol interferes with the absorption of B vitamins and increases the rate at which your body flushes them out, making the supplement less effective.

High-fat meals

Vitamin D is fat-soluble. Taking your supplement with a meal that contains some fat (such as eggs, avocado, or nuts) helps your body absorb the vitamin more effectively.

Tea and Coffee (Caffeine/Tannins)

Drinking large amounts of tea or coffee can make it harder for your body to absorb Vitamin B1 (thiamine). Try to take your supplement at a different time of day to your caffeinated drinks.

Using other medicines

Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.