Reviewed by Sarah Law, Naturopathic Nutritionist
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.
If you are on HRT and want a collagen to take alongside it, the practical brief is 5 to 15 g of hydrolysed collagen peptides daily, taken consistently, from a brand that publishes the test results for the batch you are actually buying. Our Ultimate Collagen Peptides provides 15 g of BODYBALANCE® hydrolysed bovine peptides with 200 mg of vitamin C in every 18.2 g serving, 30 servings to a 547 g tub, which works out at £1.63 per serving one-off or £1.47 on subscription.
Batch 06500062 was tested by Eurofins to ISO/IEC 17025 and the full report is published on the product page as a downloadable PDF, with a 60-day money-back guarantee if it does not suit you. The measured results are reproduced in the batch testing table further down this page.
- Oestrogen promotes collagen synthesis in skin and tendon; postmenopausal women lose up to 30% of skin collagen in the first five years after menopause [3].
- HRT has been shown to increase type I collagen synthesis in tendon tissue, supporting structural collagen beyond just skin quality [1].
- Collagen peptides (typically 5–10 g per day) are generally considered safe and well-tolerated with no known interactions with HRT medications.
- Combining HRT with collagen peptides provides both hormonal support for collagen production and the direct amino acid building blocks for repair.
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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, and HRT can partially reverse those changes [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
Does HRT Increase Collagen Production?
Yes. Restoring oestrogen through HRT increases collagen synthesis, and the effect has been measured in tissue rather than inferred from appearance. In a randomised study of postmenopausal women, transdermal oestrogen replacement significantly raised type I collagen synthesis in tendon, both at rest and in response to exercise [1]. Reviews of menopausal skin report improvements in dermal thickness and hydration where HRT is used [2].
What HRT does not do is replace collagen directly. It restores the hormonal signal that prompts fibroblasts to build collagen, but the raw material for that build still has to come from dietary protein. This is the gap collagen peptides fill. An 18.2 g serving of our Ultimate Collagen Peptides was measured by Eurofins at 6.64 g glycine, 2.35 g proline and 1.74 g hydroxyproline, the three amino acids that form the repeating structure of the collagen triple helix.
The practical summary is that HRT and collagen peptides act on different halves of the same process: one restores the signal, the other supplies the substrate. Neither substitutes for the other, which is why the two are usually discussed as complementary rather than competing.
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.
Can You Take Collagen With HRT Patches?
Yes, and the delivery route of your HRT does not change the answer. Collagen peptides are digested as ordinary food protein and absorbed as amino acids, so they have no bearing on transdermal oestrogen from patches or gels, which enters the bloodstream through the skin and bypasses the gut and first-pass liver metabolism altogether. There is equally no established interaction with oral oestradiol tablets, with implants, or with vaginal preparations.
The only practical point is timing, and it is a matter of habit rather than pharmacology. Patches and gels release oestrogen continuously, so there is no peak dose for collagen to clash with, and nothing requires you to space the two apart. If you take oral HRT with breakfast and prefer to keep that moment uncluttered, taking collagen later in the day is perfectly reasonable, but it is a preference, not a precaution.
Consistency matters far more than timing. Studies of collagen peptides generally run for 8 to 12 weeks before measuring skin or joint outcomes, so a serving you will actually take every day beats a theoretically better one you skip. Our Ultimate Collagen Peptides is unflavoured and mixes clear, which is why most customers stir it into tea, coffee or water rather than building a separate routine around it.
Does Taking Collagen Increase Oestrogen Levels?
No. Collagen peptides contain no oestrogen and no phytoestrogens, and there is no evidence that they raise circulating oestradiol. Hydrolysed collagen is a protein broken down into short peptides and free amino acids, dominated by glycine, proline and hydroxyproline. None of these has activity at the oestrogen receptor.
This matters for two groups of women in particular. The first are those who have been advised to be careful with oestrogenic compounds and assume collagen belongs on that list. It does not, though anyone working to specific dietary restrictions set by a clinician should confirm the detail with them rather than with an article. The second are women hoping collagen might serve as a natural alternative to HRT. It will not: it supplies building material, not the hormone. The phytoestrogens people usually have in mind are the soy isoflavones discussed further down this page, and those are a different class of compound entirely.
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 such as 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.
| Factor | Japanese Population | Western Population |
|---|---|---|
| Daily isoflavone intake | 25–50 mg | <2 mg |
| Dietary collagen sources | High (fish, broths, cartilage) | Low to moderate |
| Reported hot flush frequency | Lower | Higher |
| Soy food consumption | Daily in many cases | Occasional |
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, so 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:
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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.
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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.
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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.
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. For a bovine option, Love Life Supplements' Ultimate Collagen Peptides provides a 15 g serving of BODYBALANCE® hydrolysed collagen peptides with Vitamin C, sourced from grass-fed cattle and manufactured in the UK to GMP standards. 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.
What Independent Testing Showed: Batch 06500062
Most collagen brands publish a specification, which is a statement of what a product is meant to contain. The table below is different: it is the measured result for the batch currently on sale, tested by Eurofins and reproduced here in full, including the one line where the measured amount came in a shade under the label. Amino acids were run by ion chromatography (ISO 13903), vitamin C by LC-DAD at Eurofins Vitamin Testing Denmark, heavy metals by ICP-MS (DIN EN 15763) and microbiology to ISO methods, with the laboratory accredited to ISO/IEC 17025.
| What was tested | Label claim | Measured, per serving | Verdict |
|---|---|---|---|
| Glycine | 6.32 g | 6.64 g | Confirmed |
| Proline | 1.89 g | 2.35 g | Confirmed |
| Hydroxyproline | 1.79 g | 1.74 g | Confirmed |
| Vitamin C | 200 mg | 200 mg | Confirmed |
| Lead, cadmium, mercury, arsenic, nickel | Within limits | Below the detection limit by ICP-MS | Pass |
| Salmonella, E. coli, yeasts and moulds | Within limits | Not detected or within limits | Pass |
The full Eurofins certificate of analysis is published as a PDF on the Ultimate Collagen Peptides page, and the report number can be verified with Eurofins directly. Heavy metal accumulation is a reasonable question to ask of any collagen taken daily for years, which is the pattern most women on HRT are considering, and it is the reason the results are published rather than summarised.
On cost, a 547 g tub holds 30 servings at £48.95, which is £1.63 per serving. On the monthly subscription it is £44.06, or £1.47 per serving, with free delivery and the option to skip or cancel at any point. A 60-day money-back guarantee applies if it does not suit you.
Frequently Asked Questions
Can you take collagen supplements with HRT?
Yes. Collagen peptides have no known pharmacokinetic interaction with hormone replacement therapy, because they are digested as food protein and absorbed as amino acids rather than metabolised through the liver enzyme pathways that handle oestradiol. Tell your prescribing clinician what you are taking, as you would with any supplement, and check the label of your specific product for additional active ingredients.
Can you take collagen and oestrogen together?
Yes, and the two act on different parts of the same process. Oestrogen signals fibroblasts to produce collagen, while collagen peptides supply the glycine, proline and hydroxyproline used to build it. No contraindication has been established between them, whether the oestrogen comes from a patch, gel, tablet or implant.
Does HRT replace collagen?
No. HRT restores the oestrogen signal that drives collagen synthesis, but it does not supply collagen itself, and the raw material still has to come from dietary protein. This is why collagen supplementation is generally discussed as complementary to HRT rather than as a substitute for it, or the reverse.
How much collagen should you take a day alongside HRT?
Most clinical studies of hydrolysed collagen peptides use 5 to 15 g per day, taken daily for 8 to 12 weeks before outcomes are assessed. Our Ultimate Collagen Peptides delivers 15 g of BODYBALANCE® peptides plus 200 mg of vitamin C per 18.2 g serving. Vitamin C matters here because it is required for the hydroxylation steps that stabilise the collagen triple helix.
Which is the best collagen to take during menopause?
There is no single best type, but the useful filters are the form, the dose and the evidence of testing. Hydrolysed peptides are absorbed better than intact collagen, a serving in the 5 to 15 g range matches what has been studied, and a published batch certificate tells you what is actually in the tub. Marine collagen is predominantly type I, which is the dominant form in skin and tendon, while bovine sources supply types I and III.
Is there an interaction between collagen and progesterone?
No interaction between collagen peptides and progesterone or micronised progesterone has been established. As with oestrogen, collagen is broken down into amino acids in the gut and does not affect the metabolism of hormone preparations. Combined oestrogen and progesterone regimens are treated the same way as oestrogen-only ones in this respect.
References
- Effects of transdermal estrogen on collagen turnover at rest and in response to exercise in postmenopausal women. · PubMed
- Managing Menopausal Skin Changes: A Narrative Review of Skin Quality Changes, Their Aesthetic Impact, and the Actual Role of Hormone Replacement Therapy in Improvement. · PubMed
- Estrogens and the skin. · PubMed
- The effect of female sex hormone supplementation on tendon in pre and postmenopausal women: A systematic review. · PubMed
- The effects of phytoestrogen isoflavones on bone density in women: a double-blind, randomized, placebo-controlled trial. · PubMed
- Round Table Discussion: Aesthetic Treatment Considerations for the Perimenopausal & Menopausal Patient. · PubMed