Two Years After Menopause with Dry Skin, a Past Foot Fracture and Knee Crepitus: What Collagen Really Does, How to Choose Calcium, D3 and K2, Protein in a Two-Meal IF Day, and Evening Blood Pressure

From a women’s health group: about two years after menopause, dry skin and a past fracture. Which collagen or supplement helps?

One member in her early 50s, about two years past menopause, has very dry skin, once fractured a foot bone and had swelling around the other ankle, and hears knee noises climbing stairs.
Her blood pressure runs somewhat high and she feels lightheaded in the evening. She eats two meals a day in an intermittent-fasting window, skips sugary drinks and pastries, walks several thousand steps daily, and asked which collagen or supplement to take.

The short answer: her habits are a good base, but a fracture after 50 matters more than which supplement brand to pick.
The first step is a doctor’s assessment of repeat-fracture risk. Collagen helps skin a little, and calcium choices should start from how much comes from food.
For calcium basics, read
Do you need extra calcium after menopause, or are vitamin D3 and K2 the gap?

1. Dry skin after menopause: how much collagen is lost, and how much does taking collagen help?

Direct answer: estrogen stimulates skin fibroblasts to make collagen. After menopause, skin collagen and skin thickness fall by about 1–2% a year,
in parallel with bone loss
(Brincat 1987,
Affinito 1999).

Why skin gets drier and thinner

Skin biopsy work found type I and type III collagen falling with years since menopause.
A review concluded that estrogen after menopause increases skin collagen, thickness and elasticity and lowers the chance of dry aging skin,
with the same effect seen in connective tissue of bone and blood vessels
(Calleja-Agius 2012).

Collagen peptides: the skin evidence

A meta-analysis of 19 randomized controlled trials with 1,125 participants aged 20–70 found that hydrolyzed collagen taken for about 90 days
improved hydration, elasticity and wrinkles more than placebo. The effect is modest and lasts only while you take it,
and the body digests collagen into amino acids and short peptides before absorption rather than delivering it straight to skin
(de Miranda 2021).

Where each collagen type lives

Skin is mainly type I collagen with type III. Bone uses type I collagen as the scaffold that calcium phosphate mineral binds to. Joint cartilage is type II.
Undenatured type II collagen at 40 mg a day lowered pain, stiffness and function scores in knee osteoarthritis more than placebo over 180 days, but that trial did not measure joint noise
(Lugo 2016).

2. A fracture after 50: why it matters more than choosing a supplement

Direct answer: a prior fracture raises the risk of the next one about 1.86-fold, and bone density explains only a small part of that risk.
The Endocrine Society guideline calls for estimating fracture risk with country-specific tools before treatment decisions, together with nutrition, exercise and fall prevention
(Kanis 2004,
Eastell 2019).

When bone loss is fastest

SWAN followed 862 women and found bone loss starts 1 year before the final menstrual period and stays fast until 2 years after it.
Over 10 years the spine lost 10.6% and the femoral neck 9.1%; women of Chinese and Japanese ancestry lost bone faster.
About two years past menopause is therefore a sensible time to assess bone
(Greendale 2012).

Around menopause = 1 year before to 2 years after the final menstrual period. Bar lengths are scaled for comparison.

What to check: DXA and FRAX

DXA measures bone density at the hip and spine and reports a T-score. FRAX
uses age, weight, height, fracture history and other factors to estimate 10-year fracture probability. The fractures that count as risk factors are low-trauma ones, such as a fall from standing height.
If risk is high, bisphosphonates (such as alendronate, risedronate, zoledronic acid) or denosumab reduce fractures, which supplements cannot replace
(Eastell 2019).

3. Calcium, vitamin D3 and K2: how to choose, and how far the evidence goes

Direct answer: get close to 1,200 mg of calcium a day from food first, then supplement only the gap.
A BMJ review found dietary calcium was not associated with fracture risk and evidence that calcium supplements prevent fractures is weak and inconsistent;
in the trials at lowest risk of bias there was no effect on fracture at any site
(Bolland 2015,
NIH ODS).

Calcium forms: look at elemental calcium

Supplement labels often list the weight of the compound, not elemental calcium. Calcium carbonate is about 40% calcium by weight, calcium citrate about 21%,
and calcium L-threonate about 13%, calculated from molecular weight. Absorption is best at no more than about 500 mg per dose,
and total intake from food plus supplements should stay at or below 2,000 mg a day from age 51.

Table: calcium forms

Elemental calcium percentages are calculated from the chemical formula; absorption depends on stomach acid and meals.

Vitamin D3 and K2: what they do and do not do

VITAL gave 2,000 IU of vitamin D3 a day to 25,871 adults not selected for vitamin D deficiency or low bone mass, followed for 5.3 years,
and found no reduction in fractures versus placebo. Vitamin D matters when you are deficient or when a doctor pairs it with osteoporosis medicine
(LeBoff 2022).
Vitamin K2 as MK-7 at 180 micrograms a day for 3 years in 244 postmenopausal women slowed bone density loss at the spine and femoral neck,
but fracture outcomes were not measured, and people on warfarin must ask their doctor first because vitamin K counteracts the drug
(Knapen 2013).

4. Two-meal IF after 50: how to plan protein without losing muscle

Direct answer: healthy older adults should get 1.0–1.2 g of protein per kg of body weight per day, about 25–30 g per meal.
A 45 kg woman therefore needs about 45–55 g a day; with two meals, each needs about 25 g or more
(PROT-AGE 2013).

IF and muscle

In the TREAT trial, adults with overweight eating 16:8 for 12 weeks lost no more weight than those eating three meals, but the IF group lost more appendicular lean mass.
For a postmenopausal woman already at a normal weight, cutting meals mainly risks too little protein and calcium rather than helping weight.
If you keep IF, make the window cover both main meals and do strength training 2–3 times a week
(Lowe 2020).

Table: sample two-meal IF day at about 45 kg

Protein values are estimates for cooked food. Adjust for conditions such as kidney disease, and ask your doctor before raising protein.

5. Knee noise on the stairs, and evening lightheadedness with blood pressure

Direct answer: knee noise without pain or swelling is common, but noise that becomes more frequent is linked to symptomatic knee osteoarthritis later.
Blood pressure should be measured at home systematically, because home readings separate true high blood pressure from temporary rises
(Lo 2018,
AHA/ACC 2025).

Knee crepitus

In the Osteoarthritis Initiative, among 3,495 people without symptomatic osteoarthritis, those reporting knee noise more often had higher odds of developing symptomatic knee osteoarthritis,
with odds ratios of about 1.5 to 3.0 by frequency. Knee noise is a cue to start caring for the muscles around the knee, not a sign that the joint is already damaged.

Knee care

• Train the front thigh muscles, for example seated knee extensions held for a few seconds or slow sit-to-stands from a chair, 2–3 times a week
• Train balance, such as standing on one leg near a support, to cut falls, which matters for anyone with a past fracture
• Walking still helps bone; if stairs hurt, reduce the number of steps for a while rather than stopping walking

Measure home blood pressure so the readings are usable

The 2025 AHA/ACC guideline classes 130–139/80–89 mmHg as stage 1 hypertension and 140/90 or higher as stage 2.
Evening lightheadedness can come from high blood pressure, a drop in pressure on standing, or dehydration during the fasting window, so measure both blood pressure and pulse when it happens.

6. Comparing options after menopause: medicines, supplements and habits

Direct answer: the options that reduced fractures in trials are osteoporosis medicines and, for suitable women, hormone therapy; supplements play a supporting role.
The North American Menopause Society states that for women under 60 or within 10 years of menopause without contraindications, the benefits of hormone therapy outweigh the risks,
including prevention of bone loss and fracture
(NAMS 2022,
Eastell 2019).

Table: comparing medicines, supplements and habits

Medicines are listed by generic name only; use them only as prescribed by your own doctor.

Myths worth correcting

Taking collagen repairs knee cartilage

Collagen is digested into amino acids and short peptides before absorption. Trials measured pain and stiffness and did not show worn cartilage growing back.

Calcium L-threonate is better than other calcium

It is about 13% elemental calcium, and no randomized human trial has measured its effect on bone density or fractures.

K2 stops calcium from depositing in arteries

This mechanism comes from laboratory and animal work. No human trial shows K2 lowers arterial calcification or heart disease.

Blood pressure above 140/90 means you need a bone scan right away

Blood pressure and bone density testing are separate. Bone testing depends on age, fracture history and other risk factors.

After menopause, bone and cartilage drop 30% in 5 years

SWAN found the spine lost about 10.6% over 10 years around menopause. The 30% figure comes from early skin collagen studies, not bone.

Frequently Asked Questions (FAQ)

Two years after menopause my skin is very dry. Why, and does collagen help?

Estrogen stimulates collagen production in skin, and after menopause skin collagen and thickness fall by about 1–2% a year, so skin becomes thinner and drier. A meta-analysis of 19 trials found hydrolyzed collagen taken for about 90 days improved hydration and elasticity more than placebo. The effect is modest, so use it alongside moisturizer and sunscreen.

I had a fracture after menopause. What should I take for my bones?

The first step is a doctor’s assessment with DXA and FRAX, because a prior fracture raises the chance of another about 1.86-fold. If risk is high, osteoporosis medicines such as bisphosphonates or denosumab reduce fractures. Get close to 1,200 mg of calcium a day from food and supplement only the gap, and take vitamin D when you are deficient or when a doctor pairs it with treatment.

Which calcium is better: carbonate, citrate or L-threonate?

Look at elemental calcium. Carbonate is about 40% and needs food; citrate is about 21% and can be taken on an empty stomach; L-threonate is about 13% and has no randomized human trials measuring bone outcomes. Whatever the form, take no more than about 500 mg per dose and no more than 2,000 mg a day in total.

Do I need vitamin D3 and K2?

The VITAL trial in 25,871 adults found 2,000 IU of vitamin D3 a day did not reduce fractures in people who were not deficient, so vitamin D matters when you are low. Vitamin K2 as MK-7 at 180 micrograms a day slowed bone density loss over 3 years, but there are no fracture data, and do not start it on your own if you take warfarin.

How much protein do I need on two-meal IF?

The PROT-AGE group recommends 1.0–1.2 g of protein per kg per day for healthy older adults, about 25–30 g per meal. A 45 kg woman should get about 45–55 g a day, for example 2 eggs with a little fish or chicken at the first meal and 100 g of cooked chicken breast or fish at the second. People with kidney disease should ask their doctor before raising protein.

Does IF cause muscle or bone loss?

The TREAT trial found 16:8 eating for 12 weeks did not beat three meals for weight loss but lost more appendicular lean mass. For a postmenopausal woman at a normal weight, cutting meals risks too little protein and calcium. If you keep IF, make each meal protein-rich and do strength training 2–3 times a week.

Is knee noise on the stairs dangerous?

Knee noise without pain or swelling is common, but a study of 3,495 people found that more frequent noise was linked to higher odds of symptomatic knee osteoarthritis later. Train your thigh muscles and balance, and see a doctor if the knee swells, feels hot, locks or gives way.

When should evening lightheadedness with borderline blood pressure send me to hospital?

Go to hospital now or call emergency services for blood pressure of 180/120 mmHg or higher with a severe headache, chest pain, breathlessness or blurred vision, or for facial droop, one-sided weakness or slurred speech. If home readings are 130/80 or higher again and again, record morning and evening for at least 7 days and book a doctor, and add a standing reading if you feel dizzy on rising.

Scientific Mechanism

Estrogen and collagen: skin fibroblasts and bone-forming cells carry estrogen receptors. When estrogen falls, type I collagen synthesis drops
while bone-resorbing cells become more active, so skin and bone thin together because they share the same connective-tissue biology
(Brincat 1987,
Calleja-Agius 2012).

The chemistry of ingested collagen: collagen is a triple-helix protein rich in glycine, proline and hydroxyproline. Hydrolyzed collagen is cut into short peptides;
some, such as prolyl-hydroxyproline, reach the blood and may signal fibroblasts to make collagen. Undenatured type II collagen keeps its three-dimensional structure
and is thought to act through gut immune tolerance, not as raw material for cartilage
(de Miranda 2021,
Lugo 2016).

Vitamin K and osteocalcin: vitamin K is the cofactor of gamma-glutamyl carboxylase, which adds carboxyl groups to glutamic acid residues of osteocalcin
so it can bind calcium ions in bone matrix. The MK-7 trial therefore used the ratio of uncarboxylated osteocalcin as a marker of vitamin K status
(Knapen 2013).

Protein and muscle: muscle protein synthesis in older adults needs more essential amino acids, especially leucine, per meal than in young adults,
so about 25–30 g of protein per meal stimulates it better than spreading protein thinly. Strong muscle supports the joints and cuts falls
(PROT-AGE 2013).

Compiled and reviewed by Asst. Prof. Dr. Norawit Raatpiboon

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