Peptides in Perimenopause: Energy and Skin Support

What women describe in their 40s

Somewhere in the early to mid 40s, a lot of women notice that the usual rules stop working. Seven hours of sleep does not feel like seven hours. The afternoon slump arrives earlier and lasts longer. Skin that used to bounce back after a late night now holds the crease. Makeup sits in places it never used to.

Some of it is hormonal. Perimenopause is the transition leading up to menopause, and the Stages of Reproductive Aging Workshop (the STRAW+10 framework clinicians use) defines it by changes in cycle length and hormone patterns rather than by a birthday. It commonly begins in the 40s and can last several years. The defining feature is not that estrogen is low. It is that estrogen and progesterone swing, sometimes high, sometimes low, month to month, before settling into the lower range of menopause. That variability is why the experience is so inconsistent: a good stretch, then a rough one, then good again.

Harlow SD, Gass M, Hall JE, et al. Executive summary of the Stages of Reproductive Aging Workshop + 10: addressing the unfinished agenda of staging reproductive aging. Journal of Clinical Endocrinology and Metabolism. 2012;97(4):1159-1168. View study

The changes women most often describe to us cluster into three areas: energy (a flatter baseline, slower recovery from exertion, a harder time getting going), sleep quality (lighter sleep, more 3 a.m. wakeups, less of that restored feeling in the morning), and skin (thinner, drier, less firm, more uneven in tone, slower to recover from a breakout or a sunburn). Hot flashes, night sweats, mood and cycle changes are the classic markers; they matter a great deal, and they are a separate conversation we come back to below.

What estrogen decline does to collagen

Skin is an estrogen-responsive organ. Fibroblasts, the cells that make collagen and elastin, carry estrogen receptors, and estrogen signals them to keep producing. It also supports the water-binding molecules in the dermis and the thickness of the outer layer. When that signal fades, skin gets thinner, drier, and slower to repair. This is well established, not speculation.

The numbers are striking. In a series of studies in the 1980s, Mark Brincat and colleagues measured skin collagen in postmenopausal women and found it fell in proportion to years since menopause, not simply with chronological age. Women who received estrogen therapy had measurably more skin collagen than untreated women, and women who started with the least collagen gained the most. The often-quoted figure that skin loses roughly 30 percent of its collagen in the first five years after menopause comes from this body of work.

Brincat M, Versi E, Moniz CF, Magos A, de Trafford J, Studd JW. Skin collagen changes in postmenopausal women receiving different regimens of estrogen therapy. Obstetrics and Gynecology. 1987;70(1):123-127. View study

Brincat M, Kabalan S, Studd JW, Moniz CF, de Trafford J, Montgomery J. A study of the decrease of skin collagen content, skin thickness, and bone mass in the postmenopausal woman. Obstetrics and Gynecology. 1987;70(6):840-845. View study

A 2013 review by M. Julie Thornton pulled the mechanism together: estrogen increases collagen content, skin thickness, hydration, and elasticity, and its loss after menopause accelerates changes that sun and ordinary aging were already driving. Most of the intervention data, the review notes, comes from putting estrogen back.

Thornton MJ. Estrogens and aging skin. Dermato-Endocrinology. 2013;5(2):264-270. View study

Here is the honest takeaway. The collagen loss of perimenopause and menopause is, at its root, a hormone story. The intervention with the most direct evidence for restoring it is estrogen, prescribed by a clinician who has weighed your full history. Peptides work on collagen through a different door, and it would be misleading to present them as a substitute for the thing that caused the change.

Peptides are not hormone therapy

Estrogen and progesterone are hormones: they bind receptors throughout the body and change how thousands of genes behave. The three compounds Vael prescribes are not hormones and do not act on hormone receptors. GHK-Cu Explore VaelGHK-Cu (Copper Peptide)The most powerful skin renewal peptide on Earth.View peptide is a small copper-binding peptide your skin uses as a repair signal. NAD+ is a coenzyme every cell uses to turn food into energy. Glutathione is the main antioxidant your cells make to keep oxidative stress in check. None of them change your estrogen level, your cycle, or the timing of menopause.

So why discuss them here at all? Because several of the changes women describe in their 40s have a second, age-related cause running alongside the hormonal one: collagen production slows independent of estrogen, NAD+ in tissue falls, oxidative damage accumulates. That is what GHK-Cu, NAD+, and glutathione act on. They are supportive options for the non-hormonal part of the picture, and only that part.

GHK-Cu: the collagen signal

GHK-Cu is a three-amino-acid peptide bound to copper. Your body makes it, and it is released from the skin's structural proteins when tissue is stressed, where it tells fibroblasts to multiply and produce collagen, elastin, and the sugars that hold water in the dermis. Measured plasma levels fall from roughly 200 ng/mL in 20-year-olds to about 80 ng/mL by 60, a decline that overlaps with, but is separate from, the estrogen curve.

That separateness is the point. Estrogen tells fibroblasts to stay in production; GHK-Cu is the repair signal they answer regardless of hormonal status. In topical trials summarized by Loren Pickart, copper peptide creams increased collagen in a higher share of women around age fifty than vitamin C or retinoic acid creams did over the same period, and improved skin thickness, elasticity, and hydration. Those studies were small and topical. Injectable GHK-Cu, which reaches skin everywhere through the bloodstream rather than only where it is applied, rests on the same mechanism plus animal wound-repair data and clinical experience. There is no randomized trial of injectable GHK-Cu in perimenopausal women.

Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. International Journal of Molecular Sciences. 2018;19(7):1987. View study

In our experience, and consistent with the topical literature, texture and hydration change first, within a few weeks, and firmness changes come later, over two to three months, because collagen turnover is slow. For the week-by-week picture and the injectable-versus-serum question, see our GHK-Cu guide for women Read nextGHK-Cu Injections for Women: What to ExpectThe copper peptide behind the blue serums, explained for women who want firmer, better-organized skin after 35: how it works, what the research actually shows, injectable vs. topical, and how a physician-prescribed cycle runs.Read article and the GHK-Cu results timeline Read nextGHK-Cu Results Timeline: Week-by-Week for WomenWhat women tend to notice in week one, month one, and month three of injectable GHK-Cu, which parts of that timeline the biology actually supports, what speeds results up or slows them down, and what happens when a three-month cycle ends.Read article .

NAD+: cellular energy

NAD+ (nicotinamide adenine dinucleotide) is the coenzyme your mitochondria use to convert food into usable energy. It is not a stimulant and does not work like caffeine; it is closer to the currency the energy system runs on.

Levels decline with age, and the decline has been measured in skin. In 2012 Hassina Massudi and colleagues analyzed human skin samples across the adult lifespan and found NAD+ content fell with age while markers of oxidative damage rose, with the relationship holding in both women and men. That study is about age, not perimenopause, and it is a tissue analysis rather than a treatment trial. But it puts the NAD+ story in the same organ we have been talking about.

Massudi H, Grant R, Braidy N, Guest J, Farnsworth B, Guillemin GJ. Age-associated changes in oxidative stress and NAD+ metabolism in human tissue. PLoS One. 2012;7(7):e42357. View study

The human evidence for supplementing NAD+ is a mixed bag worth describing accurately. There are small controlled trials of oral NAD+ precursors showing metabolic changes, including a 10-week trial of nicotinamide mononucleotide in 25 postmenopausal women with prediabetes that found improved muscle insulin sensitivity. There is very little controlled data on injectable NAD+, and none that we know of in perimenopausal women. Women who use NAD+ at Vael often describe a steadier daytime baseline over a few weeks rather than a jolt. We do not claim it fixes fatigue, and we make no claims about sleep. If your tiredness is driven by night sweats waking you, NAD+ does not address the cause. Read more in our NAD+ guide for women Read nextNAD+ Injections for Women: Energy, Focus, ResultsThe coenzyme behind the celebrity IV drips, explained for women in their thirties, forties, and fifties: what NAD+ actually does, why the "it drops with age" story is more nuanced for women than the headlines suggest, injection vs. IV vs. NMN, and what a physician-prescribed month looks like week by week.Read article .

Yoshino M, Yoshino J, Kayser BD, et al. Nicotinamide mononucleotide increases muscle insulin sensitivity in prediabetic women. Science. 2021;372(6547):1224-1229. View study

Glutathione: oxidative balance

Glutathione is a tripeptide (glutamate, cysteine, glycine) that every cell produces to neutralize reactive oxygen species and recycle other antioxidants. Skin, which takes daily UV and pollution exposure, relies on it heavily. Production tends to decline with age, and the Massudi study above found oxidative damage markers rising in skin over the same span that NAD+ fell.

For skin specifically, the most relevant human study is small and oral. A 2017 randomized trial from Thailand gave 60 healthy women oral glutathione (in reduced or oxidized form, 250 mg per day) or placebo for 12 weeks and reported a significant reduction in wrinkles at some measured sites, a trend toward higher skin elasticity, and a tendency toward lower melanin index. It was a short trial, the effects were modest, and it used an oral product rather than an injection. It is also close to the extent of the controlled human skin data.

Weschawalit S, Thongthip S, Phutrakool P, Asawanonda P. Glutathione and its antiaging and antimelanogenic effects. Clinical, Cosmetic and Investigational Dermatology. 2017;10:147-153. View study

Injectable glutathione avoids the absorption question that dogs oral forms, but the injectable skin data is thinner still. We think of it as the antioxidant support layer rather than a driver, paired with GHK-Cu working on structure. That is why the two are paired in The Radiance Stack. For a fuller comparison, see NAD+ vs. glutathione for women Read nextNAD+ vs Glutathione: Which Is Right for You?One refuels the cell, the other protects it. A plain-language decision guide for women weighing NAD+ (energy, focus) against glutathione (skin tone, antioxidant defense): what each does, how strong the evidence is, how to pick by goal, and when taking both makes sense.Read article .

When to talk to a clinician about HRT instead

We sell peptides, so read this section with that in mind, and then read it anyway. Hormone therapy is the most studied intervention for the transition, and for many women it is the right first conversation. As of August 2026, the major professional guidelines support it for bothersome vasomotor symptoms (hot flashes, night sweats) in appropriately selected women, particularly those under 60 or within 10 years of menopause, and the decision rests on an individual risk-benefit review with a clinician who knows your history.

Talk to a clinician who prescribes hormone therapy if any of the following describe you: Your sleep is broken by heat. Waking drenched or with a racing heart at 3 a.m. points to vasomotor symptoms. No peptide addresses that. Your mood has shifted in a way that worries you. New anxiety, irritability, or low mood deserves a clinician's attention on its own terms. You have vaginal dryness or pain with sex. Local estrogen is well studied; peptides do nothing here. You have a family history of osteoporosis or an early menopause. Bone protection is a hormone conversation. Your cycles have changed substantially. Very heavy or irregular bleeding needs to be evaluated, not supplemented.

None of this rules out peptides. Plenty of women use hormone therapy for the hormonal side and a peptide for the age-related side at the same time, and that is a reasonable approach as long as both prescribers know the full picture. What we want to avoid is a woman reaching for a peptide when what she needs is a conversation she has been putting off.

What Vael's physician screening asks

Every Vael prescription starts with a health screening that a licensed physician reviews. For women in the perimenopausal window, these are the questions that matter most:

Your cycle and hormonal status. Whether your periods are regular, changing, or stopped, and whether you are on hormone therapy, birth control, or anything else hormonal. This is how the physician avoids prescribing a peptide for a problem that is really a hormone problem. Pregnancy possibility. Perimenopause does not equal infertility. If conception is possible, peptides are off the table. Cancer history. Personal or family history, especially hormone-sensitive cancers. GHK-Cu's growth-signaling properties make this a hard stop for the physician to weigh. Copper, liver, kidney, and autoimmune status, plus current medications and supplements. What you are actually hoping for. If the answer is "stop the hot flashes," the physician will say so and nothing will ship.

If the physician approves, the prescription is compounded and ships fully reconstituted and ready to use, refrigerated, as a subcutaneous injection with dosing instructions. If you are unsure which peptide fits, the 60-second quiz sorts by goal, and our physicians make the final call. Product pages: GHK-Cu Explore VaelGHK-Cu (Copper Peptide)The most powerful skin renewal peptide on Earth.View peptide , NAD+ Explore VaelNAD+ (Cellular Energy Coenzyme)The coenzyme that powers energy, DNA repair, and longevity.View peptide , glutathione Explore VaelGlutathione (Master Antioxidant)The body’s master antioxidant for detox and cellular defense.View peptide , and the stacks.

Common questions