Last updated July 2026 · 5 minute read
The short answer. By your 40s natural collagen has been declining for around 20 years, and perimenopause often begins, speeding the loss. A daily high strength hydrolysed marine collagen supports skin, hair, nails and joints through this decade.
What changes in your 40s
Two things overlap. The steady decline since your mid 20s has added up, and perimenopause often begins, bringing fluctuating oestrogen and a faster drop in collagen. Skin can feel less firm, hair less full, and joints a little stiffer.
What to prioritise
This is the decade to make collagen a genuine daily habit. Choose a high strength, hydrolysed marine collagen with supporting vitamins, and pair it with SPF, protein and sleep to give your skin and joints the best support.
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.
Building the routine
- One daily cap, attached to an existing habit
- Daily SPF and a simple hydrating skincare routine
- Strength and mobility work for joints
Frequently asked questions
Should I take collagen in my 40s?
Your 40s are a key decade, as collagen has been declining for years and perimenopause often begins. A daily high strength collagen supports skin, hair, nails and joints.
How much collagen in your 40s?
A high strength daily dose of hydrolysed collagen, taken consistently. Eternal Collagen provides 15,000mg in one cap.
What is the best collagen for your 40s?
A hydrolysed marine collagen with supporting vitamins. See our best collagen for women guide.
Will collagen help perimenopause in my 40s?
Collagen supports skin, hair, nails and joints as perimenopause speeds collagen loss. For symptoms, speak to your GP.