Last updated July 2026 · 5 minute read
The short answer. Collagen supplements are generally well tolerated. Any side effects are usually mild, such as a feeling of fullness or minor digestive upset when starting. As with any food supplement, follow the guidance, do not exceed the recommended intake, and check with your GP if you are pregnant, breastfeeding or have a health condition.
Is collagen safe to take daily?
For most healthy adults, a daily hydrolysed collagen is well tolerated as part of a balanced diet. It is a food supplement, not a medicine, and is not a substitute for a varied and balanced diet or a healthy lifestyle.
Possible side effects
- A feeling of fullness
- Mild digestive changes when you first start
- An aftertaste with some products, which a flavoured liquid avoids
Who should take care
Anyone with a fish allergy should avoid marine collagen. If you are pregnant, breastfeeding, taking medication or managing a health condition, check with your GP first.
Eternal Collagen: 15,000mg in one daily cap
Hydrolysed marine collagen, enriched with 19 essential vitamins and minerals, in a tropical flavour that mixes easily into water, juice or a smoothie. One 25ml cap a day, made in the UK.
Frequently asked questions
Is collagen safe?
For most healthy adults a daily hydrolysed collagen is well tolerated. Follow the product guidance and check with your GP if you are pregnant, breastfeeding or have a health condition.
What are the side effects of collagen?
Side effects are usually mild, such as a feeling of fullness or minor digestive changes when starting. Some products have an aftertaste, which a flavoured liquid avoids.
Can I take collagen every day?
Yes, collagen is designed to be taken daily, and consistency is what delivers results. Do not exceed the recommended daily intake.
Who should not take collagen?
Anyone with a fish allergy should avoid marine collagen. Those pregnant, breastfeeding or on medication should check with their GP first.