Can I take Collagen and Omeprazole together?

You can generally take collagen and omeprazole together but it is recommended that you take them at different times.

It is usually best to take your omeprazole first thing in the morning on an empty stomach (as prescribed) and take your collagen supplement at a different time of day, such as with a meal later in the afternoon, to give your body the best chance of absorbing it.

Why this happens

Collagen is a protein that needs stomach acid to be broken down into smaller pieces (amino acids) so your body can absorb it. Omeprazole works by reducing the amount of acid your stomach produces. With less acid available, your body may find it harder to fully digest and absorb the collagen supplement.

How to know if you're having a drug interaction

You may be experiencing an interaction between collagen and omeprazole if:

• You notice reduced benefit from the collagen supplement, such as no improvement in skin, hair, or joint symptoms.

• You develop new or worsening digestive symptoms, including bloating, nausea, or indigestion.

• You experience changes in bowel habits, such as diarrhoea or constipation.

• You feel unusually tired, which may be linked to reduced nutrient absorption.

• Blood tests show low levels of certain nutrients, such as vitamin B12 or iron.

What you should do

If you have any of the above symptoms, you should:

• Speak to your GP or pharmacist for personalised advice.

• Do not stop taking omeprazole suddenly unless advised by a healthcare professional.

• Consider reviewing your supplement use, including the dose and timing of collagen.

• Seek medical advice if digestive symptoms persist or worsen.

• Attend any blood tests arranged to check for nutrient deficiencies.

Important precautions

Fish, shellfish, or egg allergies

Many collagen supplements are derived from marine or avian sources. Check the label carefully, as these can trigger severe allergic reactions in people with existing food allergies.

Severe diarrhoea

Omeprazole can increase your risk of developing a serious bowel infection called C. difficile. If you develop severe, watery, or persistent diarrhoea, you must contact your doctor immediately.

Lupus-like skin reactions - omeprazole

Seek medical advice if you develop a skin rash, especially in areas exposed to the sun, as this may be a sign of subacute cutaneous lupus erythematosus (SCLE).

Vitamin B12 deficiency

Long-term use of omeprazole can prevent your body from absorbing vitamin B12 properly. If you are taking this for more than a year, your doctor should monitor your B12 levels to prevent anaemia or nerve damage.

Food and drink warnings

Alcohol

It is best to avoid or strictly limit alcohol while taking omeprazole. Alcohol can increase the amount of acid your stomach produces, which may worsen your symptoms or make the medicine less effective. Additionally, both alcohol and omeprazole can cause dizziness or sleepiness in some people.

Caffeine (Coffee, Tea, Energy Drinks)

While there is no direct chemical interaction, caffeine can trigger the production of stomach acid. This may counteract the benefits of omeprazole if you are taking it for acid reflux or stomach ulcers.

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.