Does red light therapy improve sperm quality?

The most consistent evidence is for sperm motility (how well sperm swim). When red or near-infrared light is applied to sperm in the lab, cells make more energy (ATP) and swim better. Effects on sperm count and morphology are far less proven, and no clinical trial has yet shown improved pregnancy or live-birth rates in humans. Think supportive and mechanism-backed, not a guaranteed fix.

Is red light therapy safe for the testicles?

The testes are heat- and light-sensitive, so dose and heat are everything. Low, precise, well-targeted doses appear safe. The concern is excess: high-powered or prolonged exposure can add heat, and because the light dose-response is biphasic, too much can cancel the benefit. This is why a controllable, low-power device is preferable to a large whole-body panel for this purpose.

What wavelength of light is best for sperm?

The therapeutic optical window is roughly 630-670 nm (red) and 810-850 nm (near-infrared). For male fertility, 808-810 nm near-infrared is preferred because it penetrates deeper and the data suggest it does not raise sperm DNA fragmentation the way some pure-red wavelengths can.

How long before red light therapy shows a difference in a semen analysis?

Sperm take about 72 to 90 days to fully develop, so give any intervention (light, probiotics, lifestyle) a full three-month cycle, then re-test. A baseline semen analysis followed by a recheck at three months is the honest way to know whether it is working.

Can red light therapy raise testosterone?

Some early studies suggest light on the testes may support Leydig-cell function and testosterone, but the human evidence is thin and preliminary. Any testosterone benefit should be treated as a possible bonus, not the main reason to use it.

Is photobiomodulation a replacement for seeing a doctor or for IVF?

No. Photobiomodulation is a supportive, preconception tool, not a treatment for infertility and not a substitute for medical evaluation. Underlying issues such as infection, varicocele, hormonal problems, or very low counts need medical care. Light works best alongside good clinical guidance.

Can red light therapy for male fertility be done at home?

Yes. With the right device and a clear, conservative protocol, this is very doable at home, which lets the male partner become an active participant. Start low, go slow, keep the tissue cool, and check in with a practitioner.

The Early-Pregnancy Hormone Most Women Aren’t Told to Ask About

Austin InfertilityFertilityIVFEarly miscarriageSupplementsBest home red light device for fertility

Aug 28

Written By Tracy Donegan

If you have experienced recurrent miscarriage, you have probably heard some version of this before:

“Sometimes these things just happen.”

And yes - sometimes they do. Pregnancy loss is unfortunately common, emotionally devastating, and often related to factors outside anyone’s control, including chromosomal abnormalities.

But “common” should never mean “you don’t deserve answers.”

Because when you have had more than one early loss, it is reasonable to ask a bigger question:

“Is there anything else we could be looking at before we simply try again?”

One area that deserves more attention is estradiol in early pregnancy.

Not because it is a magic answer. Not because one lab result can predict everything. And definitely not because every miscarriage could have been prevented.

But because a 2024 NeoFertility retrospective cohort study led by Dr. Phil Boyle found something clinically important: among women with unusually low estradiol in early pregnancy, oral DHEA used as part of individualized care was associated with a substantial rise in estradiol and a lower observed miscarriage rate compared with a historical untreated group.

Let’s talk about what that means - and what it does not mean.

First: What is DHEA?

You may already know DHEA as a supplement sometimes discussed before conception, especially for women with diminished ovarian reserve, low AMH, or a history of poor response in IVF (please get your androgens and DHEA tested before starting this supplement especially in the US as it’s available OTC.

But DHEA is not simply an “egg quality supplement.”

DHEA - short for dehydroepiandrosterone - is a naturally occurring hormone made mainly by the adrenal glands and, to a lesser extent, the ovaries. It is also a ‘precursor’ hormone, meaning the body can use it as raw material to make other hormones, including testosterone and estradiol.

That matters because estradiol is not just a “cycle hormone.”

In pregnancy, estradiol rises rapidly. It supports the changing uterine environment, participates in implantation and placental development, and reflects the complex hormonal activity of an early pregnancy. Low estradiol has been associated with miscarriage in observational studies, although association does not prove that low estradiol itself is the cause.

And that is where Dr. Boyle’s paper comes in.

The question the study asked

Most women who become pregnant after IVF, IUI, or natural conception will have some form of early monitoring. Depending on the clinic and circumstances, that might include one or more beta-hCG blood tests, followed by an ultrasound around six to eight weeks.

That is helpful - and it is standard.

But routine serial estradiol monitoring after a positive pregnancy test is not standard in most fertility clinics or obstetric practices. When early pregnancy is uncertain, usual care generally focuses on symptoms, serial beta-hCG, and ultrasound.

Dr. Boyle and colleagues asked a different question:

“Could women with unusually low estradiol for their gestational age represent a group at higher risk of miscarriage - and could restoring estradiol through DHEA be helpful?”

The team reviewed pregnancies cared for at NeoFertility in Ireland between 2009 and 2017. They focused on women whose estradiol was no more than 50% of the expected level for their exact gestational age.

That timing piece is essential.

An estradiol value cannot be read in a vacuum. Estradiol should rise as pregnancy progresses, so a value that might be less concerning at four weeks could be very low at seven weeks. In the NeoFertility model, estradiol is interpreted alongside gestational age, beta-hCG, progesterone, symptoms, and ultrasound findings.

What the researchers found

The study included 114 pregnancies with low estradiol in early pregnancy:

22 women received neither estradiol nor DHEA.
52 women received oral estradiol.
40 women received oral DHEA.

The women who received DHEA had a mean DHEA dose of 24.2 mg/day, with doses ranging from 10 to 50 mg/day. The treatment began at an average of 6.9 weeks’ gestation.

Here is the part that caught my attention.

Before DHEA, the group’s average estradiol level was just 33.2% of the NeoFertility reference level for their gestational age. After one to six weeks of DHEA treatment, their average level rose to 90.2% of the reference level. That change was statistically significant, with p < 0.0001.

And when the researchers examined pregnancy outcomes:

Miscarriage rate

No estradiol or DHEA - 45.5%

Oral estradiol 21.2%

Oral DHEA 17.5%

If you are someone who has lived through miscarriage, you understand why those numbers matter.

They do not make the grief disappear. They do not rewrite the past. But they raise a powerful and hopeful clinical question:

“Could a subset of women with low estradiol in early pregnancy benefit from closer monitoring and individualized treatment?”

Why this study matters

The importance of this research is not that it gives us permission to tell every woman to take DHEA.

It does not.

The importance is that it expands the conversation.

It challenges the “wait and see” mindset

After a positive pregnancy test, many women are simply told to wait for an ultrasound. If they have had a prior early miscarriage, that wait can feel endless.

In some circumstances, serial beta-hCG is checked. In others, it is not. And while hCG is important, it does not tell us everything about the hormonal environment of early pregnancy.

Dr. Boyle’s research suggests that serial assessment of estradiol - interpreted carefully and in context - may identify a group of pregnancies with a potentially modifiable hormonal pattern.

It distinguishes low estradiol from low AMH

This is an important clarification.

Low AMH may be useful in estimating ovarian response in IVF, but it does not automatically mean a woman has low DHEA, low testosterone, or low estradiol in pregnancy. The NeoFertility materials specifically emphasize testing DHEA, DHEA-S, and testosterone rather than assuming that every woman with diminished ovarian reserve needs DHEA.

In other words: low AMH alone is not a DHEA prescription.

The goal is individualized care based on actual hormone data and the whole clinical picture.

It uses gestational-age-specific thresholds

A single estradiol value without gestational context is not useful.

NeoFertility uses different thresholds as pregnancy advances. For example, its suggested intervention threshold is below 136 pg/mL at four weeks, below 272 pg/mL at six weeks, and below 518 pg/mL at eight weeks. Those figures are specific to the NeoFertility restorative protocol - not universal reference ranges or established U.S. standards.

That is a much more thoughtful approach than reacting to one number without considering whether a woman is four weeks, six weeks, or eight weeks pregnant.

It opens the door to better research

This paper should not be the end of the conversation. It should be the beginning.

We need prospective trials that test:

Whether low estradiol independently predicts pregnancy loss after accounting for hCG, ultrasound, maternal age, embryo genetics, and other causes of miscarriage.
Whether DHEA truly improves live-birth rates in women with low early-pregnancy estradiol.
Which patients are most likely to benefit.
What the safest dose and duration are.
Maternal, fetal, newborn, and longer-term child outcomes.

The study did report follow-up data for 29 of 33 children born after DHEA-exposed pregnancies, with no reported abnormalities in sexual development at five to seven years. That is reassuring but limited; it is not enough to establish comprehensive pregnancy safety.

What women need to know

If you have had two or more pregnancy losses, especially early losses, you deserve a provider who will review your history carefully and help you understand what evaluation makes sense.

That may include looking at genetic factors, uterine anatomy, thyroid status, antiphospholipid syndrome, metabolic concerns, semen factors, ovulatory function, progesterone support when appropriate, and other individualized considerations. Standard recurrent-pregnancy-loss evaluation is generally recommended after two clinical losses.

And now, you may also want to ask a question that is not routinely part of every clinic’s protocol:

“Could serial estradiol monitoring be relevant in my next early pregnancy, given my history?”

Asking the question does not mean you are rejecting standard care or being difficult. It means you are partnering with your provider and bringing emerging research into the conversation. Research they may not be aware of.

What this does not mean

Let’s be very clear, because nuance matters.

This paper does not mean:

DHEA prevents miscarriage for everyone.
Low estradiol causes every miscarriage.
A normal hCG excludes all hormonal or pregnancy concerns.
Women should buy over-the-counter DHEA and begin it after a positive pregnancy test.
A low estradiol result should be treated without considering gestational dating, hCG, progesterone, symptoms, ultrasound, and other clinical factors.

The study was retrospective. It compared groups treated during different years. It included other individualized treatments, and most patients received progesterone; use of medications such as prednisolone and low-dose naltrexone also differed between groups. That means we cannot say DHEA alone caused the difference in miscarriage rates.

But “not proven yet” is not the same as “not worth studying.”

Your next step

If recurrent miscarriage is part of your story, save this article and bring the paper to an appointment with your provider.

You could say:

“I read a retrospective NeoFertility study on low estradiol in early pregnancy and DHEA as part of a monitored treatment protocol. Given my history, is there any role for individualized serial estradiol testing alongside hCG, progesterone, and early ultrasound?”

That is the question.

Not, “Can I start DHEA today?”

Not, “Why did no one test this before?”

Simply: “Could this be clinically relevant for me?”

Because women with recurrent miscarriage need more than another instruction to “try again.”

They need compassionate listening. Meaningful investigation. Honest communication about what is known and unknown. And care that remains open to better questions.

Tracy

Boyle P, Andralojc K, van der Velden S, Najmabadi S, de Groot T, Turczynski C, Stanford JB. Restoration of serum estradiol and reduced incidence of miscarriage in patients with low serum estradiol during pregnancy: a retrospective cohort study using a multifactorial protocol including DHEA. Frontiers in Reproductive Health. 2024;5:1321284.

Note: Red light therapy preconception may indirectly improve estradiol through ovarian-granulosa-cell, mitochondrial, inflammatory, and vascular effects.

A 2025 rat study of spinal-cord-injury–associated ovarian dysfunction found PBM improved ovarian follicular structure and was associated with significantly improved estradiol levels compared with injured, untreated animals. The treated group also showed higher ovarian expression of markers related to follicle/oocyte support, including GDF9, BMP15, and BMP4.

DHEAinfertilityIVFlow AMHearly pregnancymiscarriage

Tracy Donegan