A Realistic Starting Point for Women Over 40
Over the past month we've written a dozen posts about women's health after 40: creatine, protein, muscle, bone, brain fog, hydration, skin, and the "hormone balancing" aisle. Each one dug into a single question and followed the research wherever it went, including the places where it went against what supplement companies, us included, might prefer to say.
This post pulls it together into something more useful than a reading list: an order of operations. If you're in your 40s and want to do something sensible for how the next few decades go, where do you actually start?
The honest answer is shorter than most people expect. A few things have strong evidence and matter a great deal. One supplement has a reasonable case. Quite a lot of what's marketed to women in this decade can be safely skipped. And some questions aren't supplement questions at all.
What's actually changing in this decade
It helps to know what you're responding to.
Muscle and strength. The European Working Group on Sarcopenia in Older People, in its 2019 consensus published in Age and Ageing, describes muscle mass and strength peaking up to around age 40, holding through midlife, then declining. Beyond age 50, it cites losses of 1 to 2 percent per year in leg muscle mass and 1.5 to 5 percent per year in strength. Strength falls faster than size, which is why that group made strength, not mass, its primary diagnostic criterion.
Hormones. Menopause arrives at an average age of 51, with perimenopause typically beginning in the mid-to-late 40s, though timing varies widely. For women, the documented acceleration in muscle loss and the reduced response to training and protein appear mainly around and after menopause. Research specifically reports no significant sex difference in how middle-aged adults respond to training and nutrition. So the 40s are less a cliff than the beginning of a slope.
Bone, skin, sleep, and thinking. Bone loss and skin collagen loss both speed up as estrogen falls. Sleep often gets more disrupted. And many women notice changes in memory and focus, which the SWAN study, one of the largest long-term studies of midlife women, found to be real but modest and, so far, apparently temporary.
What changes less than you've been told. Two things came up repeatedly in our research. Hormonal shifts change some of the body's set points for fluid balance, but a 2022 review of the menstrual cycle research found no consistent effect on fluid retention, sweat rates, or electrolyte losses. And "hormone balance" isn't a measurable state at all, because healthy hormones are supposed to fluctuate.
With that in mind, here's the order we'd suggest.
Step 1: Start strength training, and keep it simple
If you do one thing from this post, make it this. Across every topic we looked at this month, resistance training kept showing up as the intervention with the strongest evidence.
The World Health Organization's 2020 guidelines, published by Bull and colleagues in the British Journal of Sports Medicine, recommend muscle-strengthening activity at moderate or greater intensity, involving all major muscle groups, on two or more days a week. For older adults, they add varied activity emphasizing balance and strength training on three or more days a week to help prevent falls. The WHO describes moderate intensity, relative to your own capacity, as usually a 5 or more out of 10.
Two details make this more achievable than it sounds. First, the WHO review found no evidence that higher volumes of muscle-strengthening activity add further health benefit, so you don't need to live in a gym. Second, in research on older adults, training does most of the work. A network meta-analysis of 38 randomized trials found that adding protein supplements to a resistance training program produced no difference on any outcome compared with the training program alone.
In practice, that means two or three sessions a week covering legs, hips, back, chest, core, shoulders, and arms, with the effort or weight increasing gradually over time. If you're new to this, a qualified coach for the first few sessions is a good investment.
And track strength, not just the scale. Because strength declines faster than muscle size, measures like grip strength and how easily you can rise from a chair without using your arms tell you more about what matters than body weight does.
For the detail, see our posts on muscle loss in midlife and on strength training after 40.
Step 2: Get enough protein, spread across your meals
Protein is the one nutritional input with a direct, well-established role in maintaining muscle, so it comes next.
The official recommended dietary allowance is 0.8 grams per kilogram of body weight per day. Several lines of research suggest that's a floor rather than an ideal. Studies using a method called indicator amino acid oxidation estimated requirements closer to 1.2 grams per kilogram, without finding differences by sex or age. Expert groups go further for older adults: the PROT-AGE Study Group recommends 1.0 to 1.2 grams per kilogram, and the ESPEN Expert Group 1.0 to 1.5 grams per kilogram. It's worth being precise that those two recommendations were written for people over 65. In your 40s, the case is about building good habits before the harder years arrive, not a sudden jump in what you need.
How you spread it matters too. PROT-AGE describes a per-meal threshold for older adults of roughly 25 to 30 grams of protein containing about 2.5 to 2.8 grams of leucine. A lot of people get most of their protein at dinner and very little at breakfast. Moving some of it earlier is one of the easiest changes available, and it doesn't require eating more overall.
One honest note on protein powders, including ours. If you're using a powder to hit that per-meal threshold, a whey-dominant protein does it more efficiently than a collagen-dominant one, because whey is much richer in leucine. Our blend leans toward collagen, so it isn't the most efficient tool for that particular job.
For the full picture, see our post on protein after 40.
Step 3: Treat sleep as part of the plan
Sleep didn't get its own post this month, but it kept surfacing in almost every topic.
In SWAN, the study behind our brain fog post, the researchers point to sleep and mood as factors that worsen during the menopause transition and that affect memory and focus. Their guidance links lack of sleep directly to poor memory and difficulty concentrating. In our magnesium research, sleep was the one area where the case for magnesium held up reasonably well, and it wasn't actually a hormonal effect, but a general one in a group of people who often sleep badly.
If night sweats are waking you, the mechanism suggests a practical step. Robert Freedman's research found that in women with hot flashes, the body's temperature buffer between sweating and shivering narrows to almost nothing, so small rises in core temperature trigger a flush. Keeping your bedroom cool targets that directly, and his review notes that cooling the body reduces hot flashes.
If your sleep is badly disrupted, that's worth raising with a clinician. Better sleep may do more for your energy and focus than anything on this list.
For more, see our posts on brain fog in midlife, magnesium and hormonal change, and hydration and hormonal shifts.
Step 4: Wear a tested sunscreen every day
For skin, the strongest evidence we found had nothing to do with nutrition.
The Nambour trial, published by Hughes and colleagues in the Annals of Internal Medicine in 2013, randomly assigned 903 adults under 55 to daily or occasional use of a broad-spectrum sunscreen and followed them for four and a half years. The daily group showed no detectable increase in skin aging, and 24 percent less skin aging than the occasional-use group. The same trial tested a beta-carotene supplement and found no overall effect.
Use a broad-spectrum sunscreen with an SPF rating and a Drug Facts label. Our Sun Balm is not one, and we've said so before. A moisturizer, including our tallow products, helps with dryness and the feel of the skin's surface, but it doesn't protect against UV or rebuild collagen.
For the detail, see our post on skin changes in your 40s.
Step 5: If you want one supplement, creatine has the clearest case
Once the first four steps are in place, creatine monohydrate is the supplement with the most consistent evidence for women in this decade, as long as you're training.
The evidence is led by strength. A 2021 review by Smith-Ryan and colleagues in Nutrients concluded that creatine appears effective for strength and exercise performance in pre-menopausal women, and found that post-menopausal women may benefit in muscle size and function at higher doses. A three-level meta-analysis in older adults found a significant strength benefit when creatine was added to resistance training, with an effect size of 0.31 and a 95 percent confidence interval of 0.18 to 0.45, though no significant effect on muscle mass. That's a modest, real benefit, not a transformation.
The standard dose is 3 to 5 grams a day of creatine monohydrate. Loading isn't necessary. Without it, your muscles reach full saturation in about three to four weeks. Timing doesn't matter much; consistency does.
The common fears mostly don't hold up. A 2023 randomized trial found no significant increase in body weight in women across any phase of the menstrual cycle. A 2025 randomized trial found no effect on hair or on the hormone DHT, though it was in young men. And reviews spanning more than a decade have found no increase in dehydration or cramping.
The real caveats: there are no human trials of creatine supplementation during pregnancy, data on perimenopausal women specifically is still limited, and anyone with kidney disease should talk to a doctor first. If you have blood tests, tell your doctor you take creatine, because it raises a kidney marker called creatinine without indicating kidney damage.
We sell creatine monohydrate. For all the detail, see our posts on creatine for women, creatine dosing, and creatine myths.
What you can probably skip
This is the list that saves money, and it's built on the same research.
Vitamin D for fracture prevention, if you're not deficient. The VITAL trial, published by LeBoff and colleagues in the New England Journal of Medicine in 2022, gave 25,871 adults vitamin D3 or a placebo and found no reduction in fractures, even in people with lower vitamin D levels at the start. In 2024, the US Preventive Services Task Force issued a draft recommendation against vitamin D supplementation for preventing fractures and falls in adults living in the community, and the Endocrine Society advised against routine supplementation in healthy adults under 75. Correcting a genuine deficiency is still worthwhile, and some groups, such as adults over 75, are still advised to supplement. We sell a vitamin D3 and K2 product, and this evidence complicates the case for it.
Collagen supplements for skin aging. A 2025 meta-analysis of 23 trials by Myung and Park in the American Journal of Medicine found benefits when all trials were pooled, but no effect in the high-quality trials or in trials not funded by industry. Industry disputes that interpretation. Our protein blend is mostly collagen, and we wouldn't recommend buying it as a wrinkle treatment.
"Hormone balancing" blends and "adrenal support." A 2016 systematic review of 58 studies by Cadegiani and Kater concluded there is no substantiation that "adrenal fatigue" is a real medical condition. Cochrane reviews found no conclusive benefit from phytoestrogens for hot flushes, apart from a narrow signal for high-dose genistein, and evidence on black cohosh that is best described as conflicting.
Brain fog supplements. The largest trial of ginkgo, involving more than 3,000 older adults, found no effect on dementia or cognitive decline. The European Food Safety Authority concluded in 2024 that a link between creatine and better cognition hasn't been established.
Standalone BCAAs, if your protein is adequate. A 2017 review by Robert Wolfe concluded that the claim that BCAAs alone stimulate muscle building is unwarranted, because muscle needs all the essential amino acids, which complete protein already provides.
High-dose vitamin C and E around your workouts. In a 2016 randomized trial by Bjørnsen and colleagues, older men taking them alongside strength training gained less muscle than those on placebo. Other studies found smaller or no effects, but there's no good evidence they help training.
Electrolytes "for your hormones." Electrolytes are genuinely useful for heavy sweating, long efforts in the heat, and very low-carb diets. The research doesn't support taking them because of hormonal changes alone. We sell an electrolyte product, and those first reasons are the honest ones.
When it isn't a supplement question
Some situations need a doctor rather than a product, and recognizing them is part of a realistic plan.
See a doctor if memory changes come on suddenly. SWAN's guidance specifically flags this. Gradual, on-and-off word-finding trouble in your late 40s fits the research pattern. Sudden change doesn't.
Get persistent fatigue, weight changes, mood changes, or changes in your cycle checked. These overlap with conditions, such as thyroid disorders, that standard blood tests can identify.
If you've been diagnosed with osteoporosis or osteopenia, kidney disease, or another condition, work with your clinician rather than substituting nutrition for treatment.
If you're pregnant or trying to become pregnant, check supplements with your obstetric provider first.
And questions about hormone therapy belong in a conversation with a clinician, who can weigh the options against your own health history.
What "realistic" means
The word is in the title for a reason.
None of the steps above will make you feel like a different person in a fortnight. Strength builds over months of consistent training. Creatine takes about three to four weeks to saturate your muscles at a standard dose, and its effect is modest. Sleep and sun protection pay off over years rather than days.
What these steps have in common is that each is backed by evidence you can look up, and together they address the changes that actually define this decade: strength, muscle, bone, skin, sleep, and focus. That's a smaller, less exciting list than the supplement aisle offers. It's also one that holds up.
The honest summary
For women over 40, the realistic starting point is short. Strength train two or more days a week, covering all the major muscle groups, as the WHO recommends, and track your strength. Eat enough protein and spread it across your meals, including breakfast. Protect your sleep, and keep your bedroom cool if hot flashes are disrupting it. Wear a tested broad-spectrum sunscreen every day. If you want one supplement on top of that, creatine monohydrate at 3 to 5 grams a day has the clearest case, as long as you're training.
Beyond that, a lot can be skipped: vitamin D for fracture prevention if you're not deficient, collagen for wrinkles, hormone-balancing blends, adrenal support, brain fog supplements, standalone BCAAs, and high-dose antioxidants around your workouts. Some of those are products we sell, and we've said so in each post.
And some things aren't supplement questions at all. Sudden memory changes, persistent unexplained symptoms, diagnosed conditions, pregnancy, and hormone therapy all belong with a clinician.
That's the whole plan. It fits on one page, and every part of it comes with a study you can check.
