DHEA sulfate

What it actually measures

DHEA is made mainly by your adrenal glands, the small structures sitting on top of your kidneys, and it functions as a precursor rather than an end product.

Your body converts it onward into testosterone and oestrogens, which is why it appears in conversations about both.

Most of it circulates in a sulfated form, DHEA sulfate, which is far more abundant and considerably more stable. That stability is what makes it the practical one to measure.

The practical convenience is real. Cortisol swings dramatically across the day and testosterone peaks in the morning, so both demand careful timing. DHEA sulfate has a long half life and no strong daily rhythm, so an afternoon draw is about as informative as a morning one.

The other defining feature is age. DHEA sulfate peaks in your twenties and declines steadily and substantially from there, which is normal physiology rather than a fault.

In women it is a meaningful contributor to total androgen activity, which is why it turns up in polycystic ovary syndrome workups.

Which direction actually carries information

The two directions on this marker do not carry equal weight, and it is worth being clear about which is which.

A genuinely high DHEA sulfate in a woman, particularly alongside irregular cycles, unwanted hair growth or acne, is worth taking seriously. It is one of the markers used in assessing polycystic ovary syndrome, and because DHEA sulfate is specifically adrenal in origin while testosterone can come from ovaries or testes too, it helps localise where androgen excess is coming from.

A markedly raised result can point at an adrenal source needing proper investigation rather than a supplement.

A low result is where I want to be more careful, because it is the number most often pressed into service for a story the evidence does not support.

You will find DHEA sulfate offered as a measure of adrenal fatigue, usually alongside a salivary cortisol curve. A 2016 systematic review in BMC Endocrine Disorders searched 3,470 articles and analysed 58 studies of the cortisol testing that concept rests on, finding conflicting results almost systematically and concluding there was no substantiation for adrenal fatigue as a condition.

There is a second problem with low results that is entirely mundane and catches people constantly. Because DHEA sulfate declines substantially and normally with age, a value that looks low against a young adult range may be completely typical for you.

Check which range your report used before concluding anything. That single step resolves a great many alarming-looking results.

Where this marker genuinely earns its place is the androgen picture: assessing polycystic ovary syndrome, localising androgen excess, and serving as one input alongside testosterone and SHBG rather than as a standalone verdict.

What moves it

Down: ageing, which is the normal and overwhelming driver. Adrenal insufficiency, which is a medical diagnosis. Long-term corticosteroid use suppressing adrenal output. Significant chronic illness. And some medications including certain hormonal treatments.

Up: polycystic ovary syndrome in women, alongside other androgen markers. Adrenal tumours or hyperplasia, which are uncommon and are the reason a markedly raised result deserves investigation. DHEA supplementation, which is common and frequently unreported. And congenital adrenal hyperplasia, typically identified earlier in life.

The honest hedge

I am not a doctor and I am not diagnosing anyone.

The single most useful correction I can offer on this marker is about the range. DHEA sulfate falls substantially with age as normal physiology, so a result flagged low against the wrong range causes a great deal of unnecessary worry and a great many unnecessary supplements.

On supplementation, I want to be plain. DHEA is a hormone precursor that converts into testosterone and oestrogens, so it has real downstream effects. Taking it on the strength of a number, particularly one read against a range that may not be age-matched, is how people produce unintended hormonal changes.

That belongs with a prescriber rather than a shopping cart.

If tiredness is your actual question, this is a poor first test. A full thyroid panel, ferritin with hs-CRP, B12 and folate and fasting insulin answer considerably more from the same draw.

And a markedly raised result in a woman with androgen signs deserves a doctor rather than a supplement plan, because the source matters.

So. What to actually do.

Tonight, at no cost. If you have a result, check which age range it was compared against. This one step resolves a great many alarming-looking low values.

Read it as one input, not a verdict. Alongside testosterone and SHBG if androgen excess is the question.

Do not draw an adrenal fatigue conclusion from it. The systematic review evidence does not support building a plan on this marker.

If it is markedly high, see a doctor. Particularly in a woman with irregular cycles, unwanted hair growth or acne, the source is worth identifying properly.

Add fasting insulin if PCOS is the question. Insulin resistance is a central feature and it is the more addressable part.

Do not supplement DHEA on a number. It converts into testosterone and oestrogens, which makes it a prescriber decision.

If fatigue is the real question, test the things that answer it. Thyroid, iron, B12 and insulin, from one draw.

You are not declining because a number is lower than it was at twenty-five. That fall is the ordinary shape of the curve, and most of the alarm around it comes from comparing yourself to a range you left decades ago.

Your body is not broken. It is blocked. And sometimes what looks like a block is simply age, measured against the wrong column.

Go check which range they used.