Ingredient
Calcium Thioglycolate
Calcium 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.
- Calcium Mercaptoacetate
- Thioglycolic Acid Calcium 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
Calcium Thioglycolate and pregnancy
Not Recommended
- Absorbed into the body
- Irritant
Calcium thioglycolate is a highly reactive chemical used in hair removal creams and perming solutions. It breaks down protein bonds in hair through a chemical process that requires alkaline pH levels, making it a potent and potentially caustic substance. During pregnancy, skin becomes more sensitive and permeable, increasing the risk of adverse reactions and systemic absorption. While specific pregnancy studies are limited, the chemical's caustic nature and potential for skin damage raise concerns. Thioglycolates can cause chemical burns that create open wounds, potentially allowing increased chemical absorption. Additionally, the strong odor can trigger nausea in pregnant women experiencing morning sickness. Most obstetricians and dermatologists recommend avoiding harsh chemical treatments during pregnancy. The American College of Obstetricians and Gynecologists (ACOG) advises caution with chemical hair treatments during pregnancy. Given the risk of skin burns, allergic reactions, and unknown systemic effects, it's prudent to postpone use of calcium thioglycolate products until after delivery. Safer alternatives for hair removal include shaving, trimming, or waiting until postpartum.
Calcium Thioglycolate and breastfeeding
Not Recommended
- Irritant
- Absorbed into the body
Calcium thioglycolate is a strong chemical depilatory agent that breaks down hair protein structure. While topical absorption data during breastfeeding is limited, the compound's caustic nature presents risks of chemical burns and skin damage. Breastfeeding women may have heightened skin sensitivity, particularly on the chest and nipple areas where products could come into contact with breastfed infants. Chemical burns or skin reactions near the breast area could interfere with comfortable breastfeeding. The strong chemical odor may also be off-putting to infants. While systemic absorption through intact skin is considered low, any skin damage or burns would increase absorption potential. Most dermatologists recommend avoiding harsh chemical depilatories while breastfeeding, especially on areas that may contact the infant. Safer hair removal methods include shaving, waxing, or waiting until after weaning to resume use of chemical depilatories.
Calcium Thioglycolate and postpartum
Caution Advised
- Irritant
- Common allergen
Calcium thioglycolate remains a strong chemical irritant in the postpartum period. While there are no specific breastfeeding concerns for non-breastfeeding mothers, postpartum skin may still be more sensitive due to hormonal changes. The risk of chemical burns, allergic reactions, and skin irritation remains high. Postpartum women should patch test carefully and consider whether their skin has returned to its pre-pregnancy resilience before using harsh chemical depilatories. Many dermatologists suggest waiting several months postpartum before resuming use of potent chemical treatments to allow hormonal stabilization.
Calcium Thioglycolate and trying to conceive
Not Recommended
- Absorbed into the body
- Irritant
Calcium thioglycolate is a harsh chemical depilatory that poses similar concerns for women trying to conceive as it does during early pregnancy. Since pregnancy detection typically occurs several weeks after conception, any product used during the TTC period could potentially affect early fetal development. Given the chemical's caustic nature and potential for increased absorption through damaged skin, most fertility specialists recommend discontinuing harsh chemical treatments when actively trying to conceive. The conservative approach is to treat the TTC period as early pregnancy and avoid potentially harmful exposures. Switching to safer hair removal methods before conception is advisable.
Calcium Thioglycolate and PCOS
Caution Advised
- Irritant
- Can inflame skin
Women with PCOS often experience hirsutism (excessive hair growth) due to elevated androgen levels, making hair removal products appealing. Calcium thioglycolate is used in chemical depilatories to remove unwanted hair. However, PCOS skin may be more prone to irritation and inflammation, and many women with PCOS also experience acne or sensitive skin. The caustic nature of calcium thioglycolate could exacerbate skin inflammation or trigger breakouts. Additionally, repeated use on sensitive or inflamed skin increases the risk of chemical burns and allergic sensitization. For women with PCOS seeking hair removal solutions, dermatologists often recommend gentler methods such as laser hair removal, prescription topical treatments like eflornithine, or mechanical methods. If using chemical depilatories, patch testing is essential, and products should be avoided on inflamed or broken skin.
Calcium Thioglycolate and general use
Caution Advised
- Irritant
- Common allergen
Calcium thioglycolate is an effective chemical depilatory used in hair removal products and permanent wave solutions. It works by breaking disulfide bonds in keratin, allowing hair to be dissolved or reshaped. While effective, it is a strong chemical that requires careful use. The FDA has documented numerous adverse reactions to calcium thioglycolate products, including chemical burns, blisters, rashes, and allergic contact dermatitis. The ingredient is particularly irritating at the alkaline pH required for efficacy. Risks are higher for people with sensitive skin, and improper use (leaving on too long, applying to broken skin) significantly increases burn risk. Some individuals develop allergic sensitization with repeated exposure. Both the FDA and EU regulations require specific pH restrictions and mandatory warning labels on products containing calcium thioglycolate. Users should always perform patch tests, follow timing instructions carefully, and never use on irritated or broken skin. Consider less harsh alternatives if you have sensitive skin or a history of allergic reactions.
Everything else flagged for the same profiles
Related ingredients
Ingredients suggested in place of Calcium Thioglycolate, each one with its own page here.
Ingredients that raise the same concerns.
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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