Ingredient
Potassium Thioglycolate
Potassium Thioglycolate is flagged for pregnancy, breastfeeding, trying to conceive, postpartum, PCOS and general use. The concern behind the strongest flag is absorbed into the body and irritant.
- Thioglycolic Acid Potassium Salt
- Mercaptoacetic Acid Potassium Salt
Verdict by profile
Truva checks every ingredient against six profiles. Jump to any of them for the full assessment.
- Strongest verdict
- Not Recommended
- Its verdict for pregnancy, the profile this one is worst in
- Profiles flagged
- 6 of 6
- Counting avoid, high risk and medium risk
- Irritancy
- 4 of 5
- Higher means more likely to sting or redden
Potassium Thioglycolate and pregnancy
Not Recommended
- Absorbed into the body
- Irritant
Potassium thioglycolate is a chemical depilatory that breaks down the protein structure of hair through disruption of disulfide bonds. It's used in hair removal creams and works by dissolving hair at the skin's surface. According to ACOG, chemical depilatories containing thioglycolates should be avoided during pregnancy due to concerns about systemic absorption through damaged or irritated skin. Studies have shown that thioglycolic acid can be absorbed systemically, and animal studies have demonstrated reproductive toxicity at high doses. The strong alkaline nature of these products increases skin permeability, potentially allowing greater absorption during pregnancy when skin may already be more sensitive. Additionally, pregnancy-related hormonal changes can increase skin sensitivity and reaction severity. Most obstetricians and dermatologists recommend avoiding chemical hair removal products during pregnancy and opting for mechanical methods instead. The FDA requires warning labels on thioglycolate products about skin burns, and this risk is heightened during pregnancy. If hair removal is desired, healthcare providers typically recommend shaving or professional waxing after the first trimester as safer alternatives.
Potassium Thioglycolate and breastfeeding
Not Recommended
- Absorbed into the body
- Irritant
Potassium thioglycolate is a chemical hair removal agent that works by breaking down keratin bonds. While specific studies on breastfeeding are limited, the ingredient's ability to penetrate skin and cause systemic absorption raises concerns. The primary concern during breastfeeding is systemic absorption through skin, especially if used on large body areas or on irritated skin. Thioglycolic acid can be absorbed into the bloodstream, and while data on breast milk transfer is limited, the compound's chemical properties suggest potential for excretion into milk. The AAD notes that chemical depilatories can cause significant skin barrier disruption, increasing absorption risk. Additionally, if used near the breast area, there's risk of infant contact with residual product. Most dermatologists recommend postponing use of chemical depilatories while breastfeeding, particularly in the early postpartum months. The combination of potential systemic absorption and strong irritant properties makes this a high-risk choice. Mechanical hair removal methods are considered safer alternatives during the breastfeeding period.
Potassium Thioglycolate and postpartum
Caution Advised
- Irritant
For postpartum women not breastfeeding, potassium thioglycolate presents primarily as a strong irritant rather than a systemic concern. Postpartum skin may be more sensitive due to hormonal fluctuations and potential barrier disruption. The main consideration is increased skin sensitivity during the postpartum period. Hormonal changes can make skin more reactive to irritants, increasing the risk of chemical burns, allergic reactions, or prolonged irritation. Women with postpartum melasma or hyperpigmentation should be particularly cautious, as irritation can worsen pigmentation issues. Always perform a patch test and avoid use on compromised or very sensitive skin.
Potassium Thioglycolate and trying to conceive
Not Recommended
- Absorbed into the body
- Fertility effects
Potassium thioglycolate is a chemical depilatory that should be approached with caution when trying to conceive. While specific fertility studies are limited, the potential for systemic absorption and reproductive toxicity observed in animal studies warrant a conservative approach. Animal studies have shown reproductive toxicity with thioglycolic acid exposure, and while topical use differs from systemic exposure, the compound can be absorbed through skin, especially if barrier function is compromised. Since the exact timing of conception is often unknown, and early pregnancy is a critical developmental period, many healthcare providers recommend discontinuing use when actively trying to conceive. The strong irritant properties also make it unsuitable for use during a time when you want to minimize chemical exposures.
Potassium Thioglycolate and PCOS
Caution Advised
- Irritant
Potassium thioglycolate is a chemical depilatory commonly used by women with PCOS who experience hirsutism (excess hair growth). While it can effectively remove unwanted hair, it carries significant irritation risks. Women with PCOS often have more sensitive skin due to hormonal imbalances and may be using other topical treatments for acne or insulin resistance. The strong irritant properties of thioglycolates can compromise skin barrier function and may worsen inflammatory skin conditions common in PCOS. Repeated use in the same areas can lead to cumulative irritation and potential post-inflammatory hyperpigmentation, which is already a concern for many PCOS patients. Dermatologists often recommend women with PCOS explore alternative hair removal methods such as professional laser hair removal, which can provide longer-term results with less irritation. If chemical depilatories are used, they should be applied cautiously, with thorough patch testing, and not combined with other potentially irritating treatments on the same day.
Potassium Thioglycolate and general use
Caution Advised
- Irritant
- Common allergen
Potassium thioglycolate is a chemical depilatory agent that dissolves hair by breaking down keratin protein bonds. It provides quick hair removal without cutting but requires careful application and adherence to timing instructions. The FDA has documented numerous adverse event reports related to thioglycolate-containing products, including chemical burns, blistering, scarring, and severe allergic reactions. The ingredient has a high pH (typically 11-12) that can damage skin's protective barrier, leading to irritation, redness, and sensitivity. People with sensitive skin, eczema, or compromised skin barriers are at higher risk for severe reactions. Allergic contact dermatitis can develop with repeated use, and reactions may worsen over time. The EU restricts thioglycolates to specific concentrations and requires products to have pH levels between 7-12.7, with mandatory user warnings on labels. Patch testing is essential before each use, as sensitivity can develop even after previous safe use. Products should never be left on longer than directed, used on broken skin, or applied to facial areas unless specifically formulated for that purpose. Alternative hair removal methods may be preferable for those with sensitive skin or concerns about chemical exposure.
Everything else flagged for the same profiles
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Where this came from
Truva summarises published guidance from bodies including ACOG, the FDA, the EU SCCS and the Cosmetic Ingredient Review. It has no access to your medical history and it is not a substitute for your doctor, dermatologist or midwife. These assessments have not been reviewed by a clinician, and nothing here is a diagnosis or a prescription. If you are pregnant, breastfeeding or being treated for PCOS, take the ingredient list to the person looking after you.
Assessment last pulled from the ingredient database on .
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