Red Light Therapy During Pregnancy: Is it Safe?

TL;DR

-   Red light therapy is generally considered safe during pregnancy based on how it works. It is non-ionising, does not emit UV radiation, does not generate heat at therapeutic levels, and does not enter the bloodstream.

-   There are no large-scale controlled clinical trials specifically on red light therapy in pregnant women. This evidence gap is why most healthcare providers take a cautious approach, particularly in the first trimester.

-   The consistent guidance is to avoid applying red light therapy directly over the abdomen during pregnancy. For all other areas, risk appears theoretical rather than demonstrated.

-   First trimester caution is warranted given organ development. Second and third trimester use for back pain, skin health, mood, and sleep has more supporting context from related research.

-   Always consult your obstetrician or midwife before starting or continuing red light therapy during pregnancy.

Pregnancy brings with it a long list of things to reconsider, from skincare ingredients to supplements to wellness treatments. If you have been using red light therapy before falling pregnant, or are exploring it now for back pain, skin changes, mood, or sleep, the question of whether it is safe is a reasonable and important one to ask.

The honest answer is nuanced. Red light therapy has a strong safety profile in the general population, and the mechanism by which it works does not suggest obvious risk during pregnancy. But pregnancy-specific research is limited, and that gap in evidence is why most practitioners take a cautious approach. This article works through what we actually know, what we do not know, and how to approach use across each trimester.

How Red Light Therapy Works and Why Pregnancy Raises Questions

Red light therapy, also known as photobiomodulation (PBM), uses specific wavelengths of red and near-infrared light to stimulate cellular function. The light is absorbed by mitochondria, increasing ATP production and triggering anti-inflammatory and tissue repair processes. As confirmed in a foundational review by Chung et al. published in the Annals of Biomedical Engineering (2012), the therapy is non-ionising, does not emit UV radiation, and does not generate significant heat at therapeutic distances.

The reason pregnancy raises questions is not because red light therapy has demonstrated harm in pregnant women, but because the unique physiology of pregnancy demands a higher standard of evidence before any new therapy can be fully endorsed. The developing foetus is sensitive to environmental influences, particularly in the first trimester during organ formation, and the lack of pregnancy-specific controlled trials means we cannot rule out effects we have not yet studied.

What the Research Shows

How red light interacts with tissue

A key piece of evidence relevant to pregnancy is how red light behaves in tissue. A 2013 study by Avci et al. published in Seminars in Cutaneous Medicine and Surgery confirmed that red and near-infrared light targets the epidermis and dermis without entering the systemic circulation. Dr Tania Romano, Head of Medical and Education at SkinCeuticals Australia and a researcher with a PhD in human physiology focusing on foetal growth restriction, has stated directly that since LED light does not make its way into the maternal bloodstream, nothing from the light crosses the placenta.

The Australian premature baby pilot study

One of the most compelling pieces of evidence supporting the biological safety of red light in vulnerable populations comes from an Australian pilot study on premature neonates. Premature babies from 27 weeks of gestation exposed to daily 670nm red light showed a 100% survival rate, compared to 89% in the control group. While this examined neonates rather than in-utero exposure, it provides meaningful context for the safety of therapeutic red light wavelengths even in the most sensitive early-life stages.

Pregnancy-adjacent clinical research

A randomised controlled trial on light therapy for depression during pregnancy found significant mood improvements in pregnant women using different light sources, with no adverse foetal outcomes reported. SAD light therapy, which uses bright visible light in the same general spectrum as red light therapy, has an established evidence base for prenatal depression with documented safety.

Research published in the Journal of Photochemistry and Photobiology (2025) found that red light reduced inflammatory markers and oxidative stress in uterine tissue models, supporting the plausibility of its anti-inflammatory effects being relevant during pregnancy rather than harmful.

A separate study found red light therapy could support placental health and vascular function under specific circumstances, though researchers emphasised this is early-stage evidence requiring further investigation before clinical application.

Trimester-by-Trimester Guidance

First trimester (weeks 1 to 12): Most cautious approach recommended

The first trimester is the period of greatest developmental sensitivity. Major organ systems form during weeks 3 to 8, and miscarriage risk is naturally highest in this window. While there is no specific evidence that red light therapy causes harm during early pregnancy, the combination of developmental sensitivity and limited research justifies the most conservative approach.

Most OB/GYNs and midwives recommend limiting new wellness treatments in the first trimester unless there is a clear clinical need. If you were using red light therapy before pregnancy, discussing with your healthcare provider whether to pause or continue during the first trimester is the appropriate step.

-   Avoid applying any red light device over the abdomen.

-   Facial and scalp applications carry the least theoretical risk given distance from the foetus.

-   Discuss continuation with your obstetrician or midwife before proceeding.

Second trimester (weeks 13 to 26): More context for cautious use

By the second trimester, major organ formation is complete. Many pregnant women experience back pain, hip discomfort, skin changes, sleep disturbances, and mood challenges during this period. These are conditions where red light therapy has documented benefits in non-pregnant populations, and where the risk profile shifts toward manageable theoretical concerns rather than acute developmental sensitivity.

For back and lower back pain, hip discomfort, and leg swelling, applying a pad or panel to the back, hips, or legs carries no direct foetal exposure and may provide meaningful relief without medication. The anti-inflammatory and analgesic effects documented in a 2019 review of photobiomodulation for pain management are directly applicable here.

-   Continue to avoid direct application over the abdomen.

-   Back, hips, legs, shoulders, and face remain the most appropriate treatment areas.

-   Sessions of 10 to 15 minutes are appropriate. Avoid prolonged exposure or sessions that generate notable warmth.

-   Keep your healthcare provider informed of use.

Third trimester (weeks 27 to birth): Same principles, practical considerations

The third trimester shares the second trimester's risk profile. Back pain and pelvic girdle pain are extremely common and often undertreated due to medication limitations. Red light therapy applied to the back, hips, and lower limbs remains a drug-free option worth discussing with your care provider.

As the abdomen grows significantly in the third trimester, maintaining a clear boundary around abdominal application becomes even more important. Device positioning should ensure no direct light is applied to the bump, particularly given the closer proximity of the foetus to the surface.

What to Avoid During Pregnancy

-   Do not apply red light therapy directly over the abdomen at any stage of pregnancy.

-   Avoid the pelvic region given its proximity to the uterus.

-   Do not use red light therapy if you are taking photosensitising medications. Check with your pharmacist or prescriber.

-   Avoid high-irradiance full-body devices that generate significant heat, as elevated core body temperature during pregnancy carries documented risks particularly in the first trimester.

-   Do not use without discussing with your obstetrician or midwife first, particularly if you have any pregnancy complications including preeclampsia risk, placenta praevia, or other conditions.

Red Light Therapy While Breastfeeding

The evidence picture for breastfeeding is more straightforward. Red and near-infrared light does not enter the bloodstream and does not affect breast milk composition. As confirmed by the proposed mechanisms review by de Freitas and Hamblin (2016), photobiomodulation acts at the local tissue level through cellular mechanisms that have no systemic hormonal or bloodstream pathway. This means nothing from the light therapy reaches breast milk.

Standard safe use guidelines apply: avoid direct application to inflamed or infected breast tissue, and follow normal session length and distance guidelines for all other areas. For postpartum recovery, skin health, and mood support, standard red light therapy use is generally considered appropriate during breastfeeding.

Potential Benefits During Pregnancy

-   Back pain and pelvic girdle pain relief. Red light therapy's anti-inflammatory and analgesic effects are well documented for musculoskeletal pain, which is highly relevant given the limitations on pain medication during pregnancy.

-   Skin health. Pregnancy brings hormonal skin changes including acne, stretch marks, and hyperpigmentation. Red light stimulates collagen production and supports skin repair without the chemical agents contraindicated in pregnancy.

-   Mood and sleep support. Light therapy's effects on circadian rhythm and mood are documented in both general and pregnancy research. Prenatal depression affects a significant number of pregnant women and is often undertreated due to medication concerns.

-   Oedema and swelling. Improved circulation from near-infrared light may help reduce the leg and ankle swelling common in the second and third trimesters.

StreamShop Devices Suitable for Use During Pregnancy

For pregnant women who have been cleared by their healthcare provider, the following StreamShop devices are well suited to pregnancy-appropriate applications. All are positioned for use on the face, back, hips, and limbs, keeping treatment clearly away from the abdomen.

Portable red light therapy pad

StreamShop's portable red light therapy pad with near-infrared is the most practical option for pregnancy. Its flexible, wearable design allows it to be positioned directly on the lower back or hips for targeted pain relief, with no risk of abdominal exposure. The 10 Hz and 40 Hz pulse modes and near-infrared wavelengths support deeper tissue relief for the back and pelvic girdle pain common from the second trimester onwards.

Professional LED light therapy dome

StreamShop's professional LED light therapy machine is a dedicated facial device suited to the skin health and mood support applications where facial red light therapy has the strongest pregnancy-relevant evidence base. For managing hormonal acne, supporting skin elasticity as the body changes, and morning light therapy for mood and circadian support, a facial device used at appropriate distance is one of the lower-risk applications during pregnancy.

TGA-approved laser mask

For facial applications, StreamShop's TGA-approved laser mask uses 1064nm VCSEL laser technology in a wearable face-only format. Its fixed geometry means irradiance is calibrated at the device level, removing the need for distance management. For pregnant women cleared to use facial red light therapy for skin health or mood support, the mask offers precise, controlled delivery without any risk of abdominal exposure given its face-only design.

Frequently Asked Questions

Is red light therapy safe during pregnancy?

Based on how red light therapy works, it is unlikely to pose direct risk during pregnancy. It is non-ionising, does not emit UV radiation, does not enter the bloodstream, and does not cross the placenta. However, there are no large-scale controlled clinical trials specifically in pregnant women, so most healthcare providers recommend a cautious approach, particularly in the first trimester. Always consult your obstetrician or midwife before using.

Can you use red light therapy while pregnant?

Many women use red light therapy during pregnancy, particularly from the second trimester onwards for back pain, skin health, and mood support. The consistent guidance is to avoid applying it over the abdomen and to discuss use with your healthcare provider first. First trimester use should be approached most conservatively given the period of organ development.

Is red light therapy safe during pregnancy on the face?

Facial use carries the least theoretical concern given the distance from the foetus. Red light does not enter the bloodstream, so facial application does not create systemic exposure. As with all pregnancy use, consulting your healthcare provider first is recommended, and standard eye protection should be worn.

Can red light therapy help with pregnancy back pain?

Red light therapy has well-documented anti-inflammatory and analgesic effects for musculoskeletal pain. Applied to the lower back or hips with the device clearly away from the abdomen, it may offer a drug-free option for the back and pelvic pain common during pregnancy. Discuss with your midwife or obstetrician before starting.

Is red light therapy safe during the first trimester?

Most healthcare providers recommend a cautious approach to any new wellness treatment in the first trimester, when organ development is at its most sensitive stage. While there is no direct evidence of harm from red light therapy during early pregnancy, the lack of controlled trials means erring on the side of caution is appropriate. If you were using red light therapy before pregnancy, discuss with your provider whether to pause during the first trimester.

Can you use red light therapy while breastfeeding?

Yes, red light therapy is generally considered safe during breastfeeding. The light does not enter the bloodstream and does not affect breast milk. Standard use guidelines apply: avoid direct application to inflamed or infected breast tissue, and follow normal session length and distance guidelines for other areas.

What areas should be avoided for red light therapy during pregnancy?

The abdomen and pelvic region should be avoided at all stages of pregnancy. All other areas including the face, back, hips, and lower limbs can be treated with appropriate attention to session length and distance. Use devices that allow clear positioning control, and avoid high-heat generating devices.

Can red light therapy help with mood during pregnancy?

Light therapy has documented effects on mood, circadian rhythm, and serotonin regulation. Research on light therapy for depression during pregnancy has found mood improvements with no adverse foetal outcomes. Facial red light therapy in the morning may support circadian regulation and mood. This is one of the lower-risk applications given the distance from the foetus and the established safety context of light therapy for mood in pregnant populations.