Bath Bombs, Bubble Baths & Epsom Salt Soaks
Everyday exposureBeauty & personal careAlso called · 9 names▾▴
bath bombs pregnancy, bubble bath pregnancy, Epsom salt bath pregnancy, bath oils pregnancy, bath additives pregnancy, bath water temperature pregnancy, essential oils bath pregnancy, bath bomb breastfeeding, Epsom salt breastfeeding
Body & fragrance
General information · effects depend on amount, timing, and how it is used. About these sources
Research strength: 2 / 5
ACOG advises against hot tubs and saunas early in pregnancy because they raise core temperature. Ravanelli et al. found limited experimental evidence on baths, with maternal core temperature as the reported outcome, not bath additives. Ask your provider about your situation.
Last reviewed: 2026-10-12
Sources
- ACOG: Can I use a sauna or hot tub early in pregnancy?Professional society
- Ravanelli et al. 2019: Heat stress and fetal risk, systematic review
Research strength: 2 / 5
Ravanelli et al. found no participant exceeded 39°C across 12 heat studies; only two assessed passive heat, and the review focused on core temperature, not bath products. Ask your provider about your situation.
Last reviewed: 2026-10-12
Sources
- Ravanelli et al. 2019: Heat stress and fetal risk, systematic review
- NHS Grampian: Vulval skin care
Research strength: 2 / 5
Ravanelli et al. report a 40°C bath experiment but describe passive-heat evidence as level D; the review measured core temperature rather than additives, and NHS guidance identifies bubble bath as a vulvar irritant. Ask your provider about your situation.
Last reviewed: 2026-10-12
Sources
- Ravanelli et al. 2019: Heat stress and fetal risk, systematic review
- NHS Grampian: Vulval skin care
Bath Bombs, Bubble Baths & Epsom Salt Soaks — Breastfeeding
Research strength: 1 / 5
No direct breastfeeding studies of bath additives were identified. French midwives favor simple, fragrance-free, rinsable products during the perinatal period by expert consensus. Ask your provider about your situation.
Last reviewed: 2026-10-12
Sources
- French National College of Midwives: Perinatal cosmetic-product guidelines
- NHS Grampian: Vulval skin care
Pregnancy
Ravanelli et al. (2019) systematically reviewed 12 experimental heat studies involving 347 pregnant participants. No participant's core temperature exceeded 39°C; the mean end-trial temperature for the hot-water-bathing exposure was 36.9°C. The review reports two passive-heating studies and describes the evidence for warm baths or sauna as level D. The review focused on maternal core temperature, not bath-product ingredients or product-specific outcomes. ACOG advises against sauna and hot-tub use early in pregnancy because these raise core body temperature; its public page does not address ordinary bath additives. Chandrasekaran et al. (2016) measured magnesium-ion permeation through human skin after topical magnesium solution. They found concentration- and time-dependent penetration, with hair follicles contributing. This was skin-permeation research, not a whole-body Epsom bath or a clinical outcome study. Gröber et al. (2017) reviewed transdermal magnesium and concluded the evidence did not support recommending this approach. Their review describes the often-cited 19-person Epsom-bath report as a commercial-site report, not a peer-reviewed journal study. Mayo Clinic Health System describes research on essential-oil aromatherapy as limited. It says commercial toiletries usually contain under 0.01% essential oils and label-directed use is not thought to increase adverse pregnancy outcomes, while higher-concentration topical use remains unstudied. The French National College of Midwives takes a broader precautionary approach and recommends avoiding essential oils by expert consensus.
Breastfeeding
The French National College of Midwives includes pregnant and breastfeeding women in its perinatal guidance and favors simple, fragrance-free, rinsable products by expert consensus. The cited sources include no direct breastfeeding studies of bath bombs, bubble baths, bath oils, or Epsom soaks.
The French National College of Midwives describes cosmetics as mixtures with variable ingredients, including possible preservatives and colorants. NHS Grampian identifies bubble bath, soap and shower gel as potential vulvar-skin irritants. Epsom salt is magnesium sulfate, the compound discussed in research on transdermal bath claims.
What was tested
Ravanelli et al. synthesized maternal core-temperature measurements during controlled exercise or passive-heat exposures; the review included two passive-heating studies, one involving a 40°C bath, and did not evaluate bath ingredients. The magnesium study measured ion permeation through human skin, not absorption from an Epsom bath or maternal blood levels. No cited study tested bath glitter, dyes, oils, or bubble-bath ingredients during pregnancy or breastfeeding.
Essential oils during pregnancy
- Source A says
- Mayo Clinic Health System says research on essential-oil aromatherapy is limited, advises against putting essential oils directly on the skin without a carrier oil, and describes starting with one drop for inhalation. It does not address commercial toiletries specifically. (Mayo Clinic Health System: Essential oils during pregnancy)
- Source B says
- The French National College of Midwives recommends avoiding essential oils during the perinatal period by expert consensus; it notes that most oils have not been assessed during pregnancy. (French National College of Midwives: Perinatal cosmetic-product guidelines)
- Why they differ
- Mayo Clinic Health System describes careful, diluted use with input from a healthcare team, while the French guidance adopts a broader precautionary recommendation because most oils have not been assessed during pregnancy.
- What the evidence shows overall
- Both sources rely on limited research. Neither provides product-specific pregnancy outcomes for bath bombs or bath oils.
- ACOG advises against sauna and hot-tub use early in pregnancy because of core-temperature rise; its public guidance page does not address ordinary bathing or bath products.
- Ravanelli et al. report two passive-heat studies, including a 40°C bath experiment; evidence was level D, with no bath-product testing or product-specific temperature recommendation.
- NHS Grampian identifies bubble bath and soap as possible vulvar irritants; its leaflet also notes that soap substitutes can make a tub or shower tray slippery.
- NHS Cornwall's recurrent-UTI guidance includes avoiding perfumed bubble bath around genitals; it describes UTIs as usually bacterial infections entering through the urethra, and does not report a causal study of bath products.
- Mayo Clinic Health System advises against applying essential oils directly to the skin and says they often need a carrier oil, such as coconut or almond oil.
- The French National College of Midwives recommends simple, fragrance-free, rinsable products and avoidance of essential oils by expert consensus during the perinatal period.
General research, not specific to pregnancy.
For general users, evidence about magnesium uptake from Epsom salt bathing remains uncertain; general vulval-care guidance separately identifies bubble bath and soap as possible skin irritants.
- Gröber et al. concluded that evidence did not support recommending transdermal magnesium and noted that the cited 19-person Epsom-bath report was not published in a peer-reviewed journal. (Gröber et al. 2017: Myth or Reality: Transdermal Magnesium?)
- Chandrasekaran et al. found concentration- and time-dependent magnesium-ion permeation through human skin, with a contribution from hair follicles; the study did not test Epsom baths or establish clinical effects. (Chandrasekaran et al. 2016: Magnesium-ion permeation through human skin)
- NHS Grampian lists bubble bath, soap and shower gel as possible vulvar irritants; this is skin-care guidance, not evidence that a bath product causes a UTI. (NHS Grampian: Vulval skin care, NHS Cornwall and Isles of Scilly: Urinary tract infections)
Experiences from moms and non-medical voices. Not medical evidence.
Many moms describe using bubble baths, bath bombs and Epsom soaks for comfort or muscle soreness; water that is not too hot appears as a recurring concern.
Some moms express concern about essential oils and genital irritation or UTIs, while others describe using scented or foaming products without problems.
Collected 2026-10-12
- ACOG: Can I use a sauna or hot tub early in pregnancy?Professional societySecondary
- Ravanelli et al. 2019: Heat stress and fetal risk, systematic reviewSecondary
- NHS Grampian: Vulval skin careSecondary
- NHS Cornwall and Isles of Scilly: Urinary tract infectionsUK governmentSecondary
- Mayo Clinic Health System: Essential oils during pregnancySecondaryPage dated 2024-03-01
- French National College of Midwives: Perinatal cosmetic-product guidelinesSecondary
- Gröber et al. 2017: Myth or Reality: Transdermal Magnesium?Secondary
- Chandrasekaran et al. 2016: Magnesium-ion permeation through human skinUS governmentPrimary
Last reviewed 2026-10-12
Independent check in progress
Not yet clinician-reviewed
Ask your provider about your situation.