Stretch Marks After Menopause: What the Collagen Research Actually Shows

Why do stretch marks look different after menopause?

Most women who notice their stretch marks changing in their fifties did not grow new ones. The marks are the same marks, often from a pregnancy 25 years earlier or a growth spurt at 14.

What changed is the skin holding them.

A stretch mark is a thinned, scarred band sitting in a field of normal skin, and how visible it is depends on the contrast between the two. When the surrounding skin is thick and full, the band reads as a faint line. As that surrounding skin thins, the contrast sharpens, and the same mark reads as a deeper groove with a more obvious sheen.

This is why the change often feels sudden even though nothing happened. The mark did not deepen. The margin around it shrank.

Rapid weight change and long-term oral steroid use can produce genuinely new striae at any age. For most women here, though, the complaint is that old marks got louder.

What is a stretch mark actually made of?

The answer is better established than you would guess, and it is not collagen.

Watson and colleagues (1998) took punch biopsies from stretch marks and from the normal skin immediately beside them, in the same women, then examined both under electron microscopy, light microscopy and immunohistochemistry. They stained for collagens I and III, for fibrillin and for elastin.

Here is what they found inside the mark compared with the skin a few millimetres away.

• The dermal matrix inside the mark was looser and more floccular than the skin next to it
• Vertical fibrillin fibres beneath the dermal-epidermal junction were significantly reduced
• Elastin fibres in the papillary dermis were significantly reduced
• Deeper elastic fibres had realigned to run parallel to that junction rather than anchoring across it

They reported no significant alterations in any other extracellular matrix component, and that includes both collagens they stained for. Their stated conclusion was a reorganization and diminution of the elastic fibre network.

Why the mark itself is an elastic fibre problem

Genetics points the same way. Tung and colleagues (2013) ran a genome-wide association analysis on nonsyndromic stretch marks and implicated elastic microfibrils, the same structures Watson found depleted under the microscope.

Two methods, one answer.

That matters commercially, and we would rather say it than sell around it. A collagen product aimed at the mark itself is aimed at a protein those biopsies found largely intact inside the lesion. The collagen story is real. It just belongs a few millimetres to the side.

What does the estrogen research show about the skin around the mark?

Here the evidence goes back to 1987 and has held up since.

Brincat and colleagues (1987) measured thigh skin collagen in 69 untreated postmenopausal women and in 37 women who had been on hormone implants for 2 to 10 years. In the untreated group, skin collagen fell significantly with each year since menopause, and in the treated group that fall was prevented. The figures most often attributed to this work are roughly 30 percent of skin collagen lost in the first 5 years after menopause, then about 2 percent per year after that, on top of the baseline decline of about 1 percent per year that Shuster and colleagues (1975) measured from the twenties onward.

Four groups, four methods, the same direction.

• Affinito and colleagues (1999) biopsied 32 women, 14 premenopausal and 18 postmenopausal, and found type I collagen, type III collagen and the ratio between them all significantly lower after menopause
• Castelo-Branco and colleagues (1994) biopsied 76 women aged 20 to 60 and found skin collagen fell significantly after the 40s and again after menopause
• Chotnopparatpattara and colleagues (2001) followed 100 early postmenopausal women for 24 weeks and recorded a significant increase in skin thickness in the hormone-treated group
• Thornton (2013), reviewing the whole field, wrote that with estrogen insufficiency skin becomes thinner with less collagen, decreased elasticity, increased wrinkling, increased dryness and reduced vascularity

The biopsy site that happens to matter here

The Castelo-Branco biopsies came from non-sun-exposed lower abdomen, 4 cm above the pubic symphysis.

That is not a random patch of skin. It is the exact territory where abdominal stretch marks live, which means the collagen decline they measured after menopause was measured in the tissue that frames them.

Is there direct evidence tying estrogen to stretch marks?

There is one study, and it is more specific than we expected to find.

Youssef and colleagues (2017) took skin from 30 women, biopsying early stretch marks, the normal skin immediately beside those marks, and skin from 10 healthy controls. They stained all of it for estrogen, androgen and glucocorticoid receptors.

Inside the stretch marks, estrogen receptor expression was significantly lower than in the perilesional skin a few millimetres away. Glucocorticoid receptor expression was raised. The authors concluded that all three receptors are involved in how early stretch marks form.

These were women with early striae, pregnancy-associated and not, not postmenopausal women, and the study describes how a mark forms rather than what happens to an old one decades later. It establishes that the tissue where a stretch mark forms is tissue with a quieter estrogen signal. It does not establish what menopause does to a mark already sitting there.

Where does shilajit's own collagen research fit, and where does it stop?

No human trial has tested shilajit, or anything else we make, against stretch marks. That goes first, because everything below is mechanism evidence and mechanism evidence is not a result.

Two human trials carry what there is.

• Das and colleagues (2016) gave 16 adults 250 mg of shilajit twice daily for 8 weeks and took muscle biopsies, and microarray analysis found a cluster of 17 extracellular matrix genes upregulated, with COL3A1 at 5.18 times baseline, COL1A2 at 5.13 times and COL1A1 at 4.61 times
• Das and colleagues (2019) ran a randomized placebo-controlled trial in 45 women with skin biopsies taken at 2 weeks and again at 14 weeks, and found the collagen genes Col1A1, Col5A2 and Col14A1 induced, with skin perfusion improved at the higher dose
• That same 2019 trial recorded no difference from placebo in skin elasticity, hydration or water loss
• The women in it averaged 42 years of age, and the paper does not describe them as postmenopausal

The third bullet is the one we are not going to bury. Elasticity is the measurement closest to what a stretch mark physically is, and it did not move.

That table is a map of where the evidence is and where it is not. Shilajit's human evidence lands on the collagen and circulation side, which is the skin around the mark. It does not land on the elastic fibre that makes the mark. Shilajit is not a hormone and does not add estrogen to the body, it supports the body's own estrogen signaling, and across every human clinical study conducted on it to date no serious adverse events have been reported.

Optimum Shilajit

Optimum Shilajit is purified Altai shilajit, standardized for fulvic acid and third-party tested for heavy metals on every batch. It is made by a small family owned company in Florida, and every box carries a 90 day money-back guarantee. It has never been tested against stretch marks, and this article has not suggested otherwise. What it offers is the real human collagen and skin perfusion research described above, which applies to the skin around a mark rather than to the mark itself.

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