Last updated: 21 March 2026

Reviewed by Sarah Law, Naturopathic Nutritionist

Can I Take Collagen While on HRT? What the Evidence Says

Yes, you can take collagen while on HRT. There are no known contraindications between collagen peptides and hormone replacement therapy, and emerging evidence suggests the two may work synergistically. Oestrogen supports collagen synthesis, so combining HRT with collagen supplementation could offer complementary benefits for skin, joints, and connective tissue during menopause.

How Does Oestrogen Affect Collagen Production?

Oestrogen plays a direct role in collagen synthesis across multiple tissues. Research confirms that declining oestrogen during menopause leads to measurable losses in skin collagen, tendon integrity, and connective tissue strength ^[2]. Studies estimate that women lose up to 30% of skin collagen in the first five years after menopause, with ongoing losses thereafter ^[3].

HRT works in part by restoring oestrogen levels, which in turn stimulates fibroblast activity — the cells responsible for producing collagen. A randomised controlled study found that transdermal oestrogen replacement significantly increased type I collagen synthesis in tendon tissue, suggesting HRT supports structural collagen, not just superficial skin quality ^[1].

Oestrogen also supports the extracellular matrix, dermal blood supply, and skin hydration. As oestrogen levels decline, the skin becomes thinner, drier, and less elastic — changes that HRT can partially reverse ^[6]. This is why many clinicians increasingly view collagen supplementation as a natural complement to HRT rather than a competing intervention.

However, it is worth noting that most studies examine HRT or collagen peptides independently. Large-scale clinical trials specifically examining the combined effect of collagen supplementation plus HRT are still lacking.

"When oestrogen declines, so does the body's ability to maintain collagen scaffolding in skin and connective tissue. HRT helps restore that hormonal signal, but collagen peptides provide the direct amino acid building blocks — glycine, proline, and hydroxyproline — that the body needs to actually rebuild. Used together, they address different parts of the same problem."

— Sarah Law, Naturopathic Nutritionist | Optimised Female

Natural dietary sources of I take collagen while on HRT that can complement supplementation.

What Does a Low Oestrogen Face Look Like?

Low oestrogen has recognisable effects on facial appearance. The most common signs include increased skin laxity, deeper nasolabial folds, thinning of the skin (reduced dermal thickness), loss of jawline definition, and a generally drier, more crepey texture ^[2]. Fine lines around the lips and eyes often deepen noticeably.

These changes occur because oestrogen receptors are present throughout the skin. When oestrogen falls, collagen production slows, elastin fibres become disorganised, and hyaluronic acid levels in the dermis drop — leading to both structural and surface changes ^[3]. The skin also loses its ability to retain moisture efficiently.

Collagen peptides supplementation has been studied for its role in improving skin elasticity and hydration. For women on HRT, addressing the oestrogen deficit hormonally while simultaneously supporting collagen levels nutritionally represents a clinically sensible dual approach. For a deeper look at how collagen supports skin appearance, see our guide to Collagen for Radiant Skin, Strong Hair & Nails.

Why Don't Japanese Women Get Menopause Symptoms?

This is a question that generates significant interest — and the answer is nuanced. Japanese women do not universally escape menopause symptoms, but population studies consistently report lower rates of hot flushes and certain menopausal complaints compared to Western women. A widely cited explanation centres on dietary isoflavones, particularly from soy-based foods such as tofu, miso, and edamame.

Isoflavones are phytoestrogens — plant compounds that bind weakly to oestrogen receptors. A double-blind randomised trial found that isoflavone supplementation positively influenced bone density in postmenopausal women, suggesting meaningful oestrogenic activity in connective tissue ^[5]. Japanese women typically consume 25–50 mg of isoflavones daily, compared to under 2 mg in most Western diets.

Diet also plays a role in collagen status. Traditional Japanese cuisine is rich in collagen-containing foods — bone broths, fish skin, and cartilage — as well as vitamin C and antioxidants that support collagen synthesis. This dietary pattern may offer partial protection against the connective tissue decline associated with menopause. Cultural differences in symptom reporting and healthcare-seeking behaviour are also likely contributing factors.

What Did Davina McCall Take for Menopause?

Davina McCall has spoken openly and publicly about her menopause experience and her use of HRT, becoming one of the UK's most prominent advocates for greater access to menopause treatments. She has spoken about using a combination of oestrogen and progesterone HRT, and has credited it with transforming her quality of life — including improvements in energy, mood, brain fog, and physical wellbeing.

McCall has also discussed the role of diet, exercise, and nutritional support — including collagen — in her broader health routine. Her advocacy has contributed to a significant cultural shift in how perimenopause and menopause are discussed in the UK, and has increased demand for both HRT consultations and complementary supplements including collagen peptides.

It is important to note that individual HRT regimens vary considerably based on hormone levels, symptoms, and medical history. What works for one person may not be appropriate for another. Always consult a GP or menopause specialist before starting or changing HRT.

What Vitamins Should You Not Take With HRT?

Most standard vitamins and supplements are safe alongside HRT, but a few warrant attention. High-dose vitamin E (above 400 IU) may have mild anticoagulant effects and should be used cautiously if you are on HRT and have any cardiovascular considerations. Very high doses of vitamin A (retinol) may affect liver metabolism of oestrogen and are best avoided.

St John's Wort is the most significant interaction to be aware of. It is classified as an enzyme inducer and can reduce the effectiveness of oestradiol-based HRT by accelerating its metabolism in the liver. This is a clinically relevant interaction, not a theoretical one.

High-dose B vitamins, particularly B6, are generally well tolerated, but there is some evidence that very high supplemental doses may affect hormone balance over time. Standard dietary supplement doses are not a concern. Vitamin D3 and magnesium are typically considered safe and complementary with HRT.

Collagen peptides themselves have no known pharmacokinetic interactions with HRT medications. They are digested as food-grade proteins, primarily into amino acids, and do not affect liver enzyme pathways relevant to oestrogen metabolism.

What Medications Should You Not Take With Collagen?

Collagen peptides are generally considered low-risk from an interaction standpoint. However, a few considerations are worth noting. Individuals taking anticoagulants such as warfarin should be aware that some marine collagen products contain omega-3 fatty acids, which can mildly potentiate anticoagulant effects — check the formulation carefully.

Those on immunosuppressant medications (for example, post-transplant patients) should consult their clinician before adding any new supplement, including collagen. There is also a theoretical consideration for individuals with hypercalcaemia, as some collagen products are combined with calcium or vitamin D.

For most healthy women taking standard HRT — whether patches, gels, tablets, or implants — collagen peptides present no established contraindications. As always, check product labels for additional active ingredients and consult your GP if you take multiple prescription medications.

"Collagen peptides are broken down into amino acids during digestion and absorbed like any other dietary protein. For the vast majority of women on HRT, there is no pharmacological reason to avoid collagen supplementation — and given what we know about oestrogen's role in collagen metabolism, there may be a genuine benefit to combining both. That said, always let your prescribing doctor know what supplements you're taking."

— Sarah Law, Naturopathic Nutritionist | Optimised Female

What Are the Top 3 Vitamins for Menopause?

While not vitamins in the strict sense, three key nutrients consistently emerge in the menopause literature as particularly valuable:

1. Vitamin D3 — Essential for bone health, immune function, and mood regulation. Postmenopausal women are at elevated risk of vitamin D deficiency, and HRT alone does not address this. A daily dose of 1,000–2,000 IU is commonly recommended by UK clinicians.

2. Magnesium — Supports sleep quality, mood, muscle function, and bone mineralisation. Many perimenopausal women are suboptimal in magnesium, which exacerbates sleep disruption and anxiety. Magnesium glycinate or malate is typically well absorbed.

3. Vitamin C — Critical for collagen synthesis. Vitamin C is required for the hydroxylation of proline and lysine — the chemical steps that stabilise collagen's triple-helix structure. A diet rich in vitamin C, or supplementation at 500–1,000 mg per day, directly supports the body's ability to produce and maintain collagen, making it particularly relevant for women focused on skin and joint health during menopause.

For women interested in the specific role collagen peptides play in hormonal health and post-menopause recovery, our dedicated guide to Collagen Peptides for Women: Supporting Hormonal Balance, Pregnancy & Post-Menopause covers this in depth.

Can You Use Mounjaro With HRT?

Mounjaro (tirzepatide) is a GLP-1/GIP receptor agonist licensed in the UK for type 2 diabetes and weight management. It works by slowing gastric emptying and reducing appetite. There are no known direct contraindications between Mounjaro and HRT. However, the slowed gastric emptying caused by GLP-1 agonists may theoretically reduce the absorption rate of oral HRT tablets. Transdermal HRT (patches or gels) bypasses this issue entirely.

If you are taking Mounjaro alongside oral HRT, discuss the timing and formulation with your prescribing clinician. Transdermal delivery is often preferred in this context. Collagen peptides are unaffected by GLP-1 agonists in any clinically meaningful way.

Woman drinking collagen powder mixed with water.

Choosing a Collagen Supplement Alongside HRT

For women using HRT, a high-quality marine or bovine collagen peptides supplement providing 5–10 g of hydrolysed collagen per day is a practical starting point. Marine collagen is predominantly Type I, the most abundant form in skin and tendon — the tissues most affected by oestrogen decline ^[4].

Love Life Supplements Marine Collagen provides hydrolysed marine collagen peptides sourced to high purity standards, making it a suitable option for women looking to support skin, joint, and connective tissue health alongside their HRT regimen. For guidance on sourcing and types, see Decoding Collagen: Marine vs. Bovine vs. Vegan Sources.

For a comprehensive overview of collagen peptides — including types, benefits, and how to choose — read The Complete Guide to Collagen Peptides: Benefits, Types & How to Choose.

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About the Author — Ben Law

Ben Law is the founder of Love Life Supplements and host of the Optimised Health Show. He is a self-confessed health, fitness and primal living fanatic and a qualified Advanced Dietary Supplement Advisor and Primal Blueprint Certified Expert. Over the last decade, Ben has helped thousands of UK customers optimise performance and recovery with transparent, research-led formulations manufactured to UK GMP and BRC standards.

Learn more about Ben.