Stretch marks are fine lines in skin that happen when quick growth or weight gain stretches the skin.

Skin is stretchy, but like your tightest jeans, they can sometimes get overstretched. Since your body is unable to keep up with collagen production, the existing collagen tears, and a stretch mark is formed.

Stretch marks are most common during puberty and pregnancy. However, people who are into bodybuilding and people who suddenly gain lots of weight can also get stretch marks.

Stretch marks are gender-blind - men can get stretch marks too! Stretch marks are commonly found on the buttocks, calves, belly, and thighs.

The colour of the stretch mark is an indicator of whether they occurred recently or later.

Red or purple stretch marks (striae rubra) are recent and still contain blood vessels under the skin and they typically respond well to treatment. White or silver stretch marks (striae alba) are older and they are typically harder, though not impossible to treat.

With time, most red stretch marks will turn white due to the emergence of pale fat from your skin.

Treatment of stretch marks should start as early as possible. Whether S1 can fix your stretch marks depends on your genetics, the way your body responds to treatment and your consistent application.

S1 can improve the appearance of stretch marks by softening, flattening and fading them over time, so that they do not contrast too much with the surrounding skin area.

It can also be used preventively during pregnancy and puberty.

Yes. S1 is created in a Japanese lab with extremely high safety standards. No side effects have been observed when S1 is used as directed, but we recommend checking with your physician if unsure.

Yes, S1 can be used while postpartum and breastfeeding. However, please avoid applying the cream on the nipple area if you are breastfeeding.

Yes, we strongly encourage teens to use it through their growing years.

Yes, men will enjoy using S1 due to how lightweight and comfortable it feels.

Butterkynd is made in Japan.

Besides our official store, we are also available on Amazon US. If you are an Amazon Prime customer, you can also make your purchase on Amazon to enjoy Amazon Prime Shipping.