Recent HuffPost reporting revealed that readers are interested in addressing a lesser-discussed phenomenon that happens to our bodies as Father Time ticks on: “old person smell.”Also called nonenal odors, experts have previously told us that this type of smell is different from regular BO and tends to have a mild to moderate organic or musty smell that varies from person to person.“It typically develops as we age through the breakdown of fatty acids in skin lipids, and its production increases in both men and women starting around age 40,” said Los Angeles-based board-certified dermatologist, Dr. Maryam Safaee.Nonenal emissions can be significantly reduced by using soaps and other skin care topicals that contain tannins (though large randomized trials are lacking to fully prove this, according to previous guidance from experts).″[Tannins] neutralize the odor molecule after it’s already formed, block the skin process that creates it in the first place, reduce the oily secretions that fuel it, and kill the bacteria that make it worse,” Safaee said. According to our experts and other reputable sources, tannins and tannic acid can be derived from a few different ingredients, such as willow bark, witch hazel, green tea extract, and, the one we’re most familiar with, persimmon. In fact, we’ve been documenting the popularity of one highly rated Japanese persimmon soap that claims to be formulated just for this purpose. According to Safaee, the back of the neck is a particularly high-output area for nonenal odors due to its concentration of skin glands, so she suggests taking extra care to apply and use your desired product in that area. You can learn more about this bar soap below, as well as other tannin-containing body and skin care products recommended by Safaee and our ingredient list-scouring team. The experts consulted for this story do not necessarily endorse the products ahead unless otherwise noted.AmazonThe famous Japanese persimmon soap, formulated to combat nonenal odorsOf course, we have to start with the soap that has been at the forefront of our nonenal odor coverage. The formula features a dense concentration of persimmon extract with more deodorizing tannins than competitors, as well as green tea extract, which is rich in antioxidants (declining skin antioxidants is one of the causes of "old person smell"). Reviewers claim that the soap's odor elimination lasts for days, and you can use the bar on areas where nonenal odors are strongest, like the back of the neck and behind the ears.AmazonAn alcohol-free witch hazel tonerAccording to Safaee, witch hazel is one of the most popular forms of tannins and although there are a lot of toner options out there featuring this ingredient, this classic witch hazel astringent by Thayers is her favorite. "Usually, most toners are made with alcohol, which can be very dehydrating to the skin. However, Thayers has the water-based witch hazel toner, which makes it gentle enough to be used daily," she said. Available in scented or unscented versions, this hydrating and irritation-free formula is also affordable enough to apply liberally not just to the face, but to key areas of the body that produce nonenal odors like the back of the neck, armpits, groin and feet.AmazonA purifying willow bark and witch hazel toner We're also choosing to feature this toner, based on Safaee's endorsement of witch hazel and the knowledge that willow bark is a rich source of tannins. The Andalou Naturals purifying toner has a pH-balanced and calming formula featuring both of the above-mentioned ingredients, as well as a fruit stem cell complex and probiotics to promote a healthy and properly functioning skin barrier. SephoraA body cleanser with green tea extract Safaee mentioned green tea as another tannin-containing ingredient useful to combat nonenal odors, so we selected Youth to the People's Superfood body cleanser, a nourishing and gently purifying formula containing both green tea and kale extracts — both of which are rich in antioxidants. Featuring notes of fresh greens, black pepper and cedarwood, the Superfood body wash also contains niacinamide, another beloved antioxidant that can hydrate and even skin tone. AmazonA Korean cleansing balm with persimmon "It’s rather rare to find a toner or cleanser with persimmon extract, but the Then I Met You Living Cleansing Balm has one of the highest sources of [it]," Safaee said. It's not just persimmon extract that makes this sorbet-soft balm a concentrated source of tannins, but also a dose of grapeseed oils. And in case you're not familiar, cleansing balms are an effective and expert-recommended way to melt away sunscreen, stubborn makeup, oil and other impurities from the skin before using a traditional cleanser in your nightly skin care routine. AmazonA tannic acid serum for visibly fading age spots"A key point to keep in mind is that serum-based products are often more effective than wash-off options, as the serum remains on the skin to work for several hours," Safaee said. She recommended the Alphascinence Tannic [CF] serum, which she said "stands out."This antioxidant-rich serum, containing 10% l-ascorbic acid (a more stabilized form of vitamin C), can help dramatically reduce melasma, sun spots, hyperpigmentation and brighten skin overall, while also preventing further skin aging by fending off environmental stressors. RevolveAn anti-aging body cream with tannic acidWe chose to include the Dr. Barbara Sturm Anti-Aging body cream for its inclusion of tannic acid as well as its potential to prevent the appearance of premature skin aging, particularly loss of firmness and elasticity. The lightwieght and fast-absorbing formula contains Indian almond, hydrating shea butter and purslane extract to help support healthy skin. PCA SkinA pigment cleansing bar for uneven skin toneAnother HuffPost editor pick based on Safaee's guidance is the PCA Skin pigment bar, a corrective cleanser that can be scrubbed across the face, on the back of the neck and behind the ears, and which features both tannic acid and witch hazel in its formula. This purifying cleanser works into a rich lather and aims to reduce irregular skin texture and pigmentation.