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Some Seventh Generation Products contain Methylisonthiazolinone ("MIT") and/or Benzisothiazolinone ("BIT") as preservatives to keep the product stable and free of microbial contamination over its shelf life. Although these products have been evaluated to be hypoallergenic and/or Made for Sensitive Skin, it does not mean that a product will not cause any allergic reaction or irritation in any person, and that a small percentage of individuals may have some form of allergic reaction or irritation to MIT or BIT. Always use as directed.

Deleo tested Lucy for sensitivity to around 70 different allergens and, at last, finally reached a conclusion: Lucy had a severe response to methylisothiazolinone.
At home, her parents tracked down the source of the MI — Suave Kids Body Wash, a product made by Unilever and marketed as “hypoallergenic” and “safe for kids’ delicate skin.”
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“Of note, products marketed as ‘gentle,’ ‘sensitive,’ ‘organic,’ or ‘hypoallergenic’ often contained MI, thus emphasizing the importance of consumer scrutiny of product choices,” the researchers noted.
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As for labels that use words like “natural” and “hypoallergenic,” Deleo says those terms mean nothing and shouldn’t guide your buying choices.

Indeed — even the federal government notes that “there are no Federal standards or definitions that govern the use of the term ‘hypoallergenic.'” The term means whatever a particular company wants it to mean… The term ‘hypoallergenic’ may have considerable market value in promoting cosmetic products to consumers on a retail basis, but dermatologists say it has very little meaning.

Fragrance-free means that fragrance materials or masking scents are not used in the product.
Unscented generally means that the product may contain chemicals that neutralize or mask the odors of other ingredients.

Unscented products are formulated to have no smell but can contain ingredients that have a smell but the smell has been neutralized by other components. A fragrance-free product cannot contain any ingredients that have been added to impart a smell but may contain ingredients that have a scent but are not added because of their scent. For example if a cream is made with an oil that has a smell, it could still be labeled as fragrance-free because the purpose of the oil is to act as an emollient, not as a scent. But it could not be labeled unscented. However, if a product is formulated with lavender, for example, but some chemical is added to mask the smell, the product can be labeled as “unscented.”

Some raw ingredients may have a scent, which may be pleasant, and some not be pleasant but have a chemical smell to it. The term unscented may be used to mean a fragrance may have been used to mask an odor that is a natural part of the raw ingredient.

Raw ingredients that may have a natural scent and do not include fragrance chemicals, may include shea butter, cocoa butter, coconut oil, most herbs, olive oil, almond oil, honey, beeswax, and others. These types of raw materials or ingredients may not bother most people, but may be very annoying to others.

It sounds silly, but "unscented" products typically have added fragrance agents used to mask the other smells. ... Masking fragrances are usually composed of toxic phthalates.
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Phthalates have been linked from everything to testicular cancer to liver cancer, but they are still in almost all synthetic fragrances, including masking agents which cause a product’s other natural scents to disappear.

Basically, a product marked “unscented” can either mean they did not add a “scent” to the product (but it may or may not still have a smell from the other ingredients and/or chemicals) or they tried to “de-scent” the product (often using masking chemicals and/or fragrance).

Phthalates must be listed among the ingredients on product labels, unless they are added as a part of the “fragrance.” Under current law, they can then simply be labeled “fragrance,” even though they may make up 20% or more of the product.

Consumers can tell whether some products contain phthalates by reading the ingredient declaration on the labels of such products.

However, the regulations do not require the listing of the individual fragrance ingredients; therefore, the consumer will not be able to determine from the ingredient declaration if phthalates are present in a fragrance.

It's not always easy to tell if a product does contain fragrance. A few keywords are used to depict whether a formula is potentially irritating (enter hypoallergenic, fragrance free, and unscented) but these terms can be misleading because they aren't regulated by the Food and Drug Administration. "The FDA does not have the legal authority to approve cosmetic products and ingredients, aside from color additives," Lortscher says. "There is no regulation specifically defining or governing the use of the term hypoallergenic, nor for the labels 'safe for sensitive skin' or 'allergy tested.' Manufacturers may make those claims even if they have no supporting evidence."
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Products labeled hypoallergenic can still have fragrance in them. If a product claims to be hypoallergenic, it means the product produces fewer allergic reactions than other conventional cosmetic products, Lortscher says. The keyword here is fewer—no product can be labeled as nonallergenic, because no product can be guaranteed not to cause an allergic reaction.

“When people talk about polycarbonate bottles, they talk about nanogram quantities of BPA [leaching out],” Warner observed back around 2009. A nanogram is a billionth of a gram. “The average cash register receipt that's out there and uses the BPA technology will have 60 to 100 milligrams of free BPA,” he reported several years back. That’s a million times more than what ends up in a bottle. (By free, he explained, it’s not bound into a polymer, like the BPA in a bottle. The individual molecules are loose and ready for uptake.)