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Soy

TYPE OF INGREDIENT​
Antioxidant, Skin-brightening agent
COMMONLY FOUND IN
Topical moisturizers and serums, Anti-aging skincare products, Products targeting hyperpigmentation

WHAT ARE THE BENEFITS OF SOY?

Soy is a multi-functional skincare ingredient rich in isoflavones, particularly genistein and daidzein, which provide antioxidant, anti-inflammatory, and skin-brightening properties. These phytoestrogens mimic some effects of estrogen, promoting collagen synthesis and helping to improve skin elasticity, making soy a beneficial ingredient in anti-aging formulations. Studies show that soy-based products enhance skin hydration and strengthen the skin barrier, leading to improved moisture retention and reduced transepidermal water loss.

Soy is also known for its ability to inhibit melanin transfer, helping to fade hyperpigmentation while promoting a more even skin tone. Unlike some skin-lightening agents, soy works gently and does not cause irritation, making it a safe option for sensitive skin. Additionally, soy’s anti-inflammatory effects help reduce redness and irritation, making it a promising ingredient for rosacea, post-inflammatory erythema, and other sensitive skin conditions.

WHAT IS SOY?

Soy is derived from the legume Glycine max and has been used for centuries in both nutrition and skincare. In dermatology, soy’s bioactive components provide multiple skin-enhancing benefits, particularly due to its antioxidant and phytoestrogenic properties.

IS SOY SAFE FOR ALL SKIN TYPES AND TONES?

Yes, soy is considered safe for all Fitzpatrick skin types (I-VI). It is non-irritating and suitable for sensitive skin, making it a popular choice for moisturizers, anti-aging serums, and pigmentation treatments. Individuals with darker skin tones (Fitzpatrick IV-VI) may particularly benefit from soy’s ability to reduce hyperpigmentation gently, without the risk of rebound pigmentation.

CONTRAINDICATIONS

Soy is well-tolerated in most individuals, but those with soy allergies should avoid both topical and oral soy-based products. Although soy contains phytoestrogens (isoflavones), current research suggests that it does not significantly impact hormone-sensitive conditions, such as estrogen receptor-positive (ER+) breast cancer. The American Cancer Society and other major health organizations have stated that moderate soy intake, whether oral or topical, is safe for individuals with hormone-sensitive conditions. However, individuals with specific medical concerns regarding estrogenic activity should consult their healthcare provider before incorporating soy-based skincare or supplements.

Sources:

  1. Natarelli N, Gahoonia J, Maloh J, et al. “Clinical Efficacy of Topical or Oral Soy Supplementation in Dermatology: A Systematic Review.” J Clin Med. 2023;12(12):4171. (PubMed)
  2. Draelos ZD, Blair R, Tabor A. “Oral Soy Supplementation and Dermatology.” Cosmetic Dermatology. 2008;21(2):92-94.
  3. Jenkins G, Wainwright LJ, Holland R, et al. “Wrinkle Reduction in Post-Menopausal Women Consuming a Novel Oral Supplement: A Double-Blind Placebo-Controlled Randomized Study.” Int J Cosmet Sci. 2014;36(1):22-31.
  4. Liu J, Deng Q, Ma Y, et al. “Soy Protease Inhibitors as Anti-Pigmentation Agents: Mechanisms and Clinical Applications.” J Drugs Dermatol. 2022;21(3):253-258. (PubMed)

La Roche Posay Retinol B3 Pure Retinol Serum

Vichy LiftActiv Pure Retinol Serum

Shereen Teymour, DO

Author

Dr. Shereen Teymour is a board-certified dermatologist with expertise in medical, cosmetic, and surgical dermatology. After completing her dermatology residency at Hackensack University Medical Center, she further honed her skills in cosmetic dermatology while practicing in Beverly Hills, where she worked with a discerning clientele and developed a refined approach to aesthetic treatments. Her focus on achieving natural, personalized results quickly gained her recognition in the industry. Dr. Teymour eventually returned to New York City to join Day Dermatology & Aesthetics as a cosmetic fellow, learning alongside industry leader, Dr. Doris Day, where she continues to hone her skills and offer state-of-the-art treatments, including laser therapies, injectables, and comprehensive skincare. Known for her meticulous attention to detail and patient-centered care, Dr. Teymour is passionate about helping patients achieve optimal skin health and beauty. Beyond her clinical practice, Dr. Teymour is actively involved in the dermatology community through lectures, publications, and symposiums. She frequently speaks on advancements in cosmetic dermatology and skincare innovations. Her dedication to education, both for her patients and peers, underscores her commitment to advancing the field. Dr. Teymour’s passion for exploration, travel, and philanthropy has taken her on numerous medical missions around the world. Outside of her practice, she loves discovering new corners of New York City, connecting with people, and spending quality time with her husband and their two Shih Tzus.