Where YOU begin to understand your skin.

YUDOYU DNA ANALYSIS

Summary

Collagen

LOWER RISK

Glycation

MEDIUM RISK

Pigmentation

MEDIUM RISK

UV Damage

HIGHER RISK

Free Radical

LOWER RISK

Sensitivity

LOWER RISK

Hello Callie,

My name is Darcy,  and I created your optimized skincare routine. I focused on your high and medium priorities based on your DNA test. I also considered your Yudoyu quiz results which told us about your skin type and feelings about your skin. Your personalized routine includes products packed with ingredients that, with consistent use, will improve current skin quality and protect your future face.  Please add lifestyle and dietary changes (outlined below) for an added boost toward happier, healthier skin!

Warmly,
Darcy and The Yudoyu Team

We are here to help if you have any questions! Email us at hello@yudoyu.com.

woman putting moisturizer on her face

YUDOYU QUIZ RESULTS REVEALED THAT YOUR SKIN IS… 

Dry Skin + Over 40

Your Personalized Routine

Click on the products to add to cart.

Cleanser

Treatment

Serum

Moisturizer

Facial Oil

Pssssst… Don’t forget to use a broad spectrum SPF every day (rain or shine!)… especially if you tested as a medium to higher risk for UV Damage or Pigmentation.

At Yudoyu, we know you might have texture, type, and scent (or no scent) preferences. Find a few more great choices and add-ons in your “just for yu shop.”

Key factors that contribute to skin aging and health.

Use the arrows to view signs and symptoms for each genetic category.

Genetics vs Epigenetics

So you just got your results, and maybe some areas scored differently than you may have expected.

And that’s ok. Why? Get ready for some news that’s sure to turn those frown lines upside down! Meet your new best friend… EPIGENETICS.

Epigenetics is the study of how our lifestyle and environment can cause changes that affect the way our genes work. This area of study continues to prove that there’s hope – that there is a lot we can do to change the hands we’ve been dealt, some of which cost hardly anything and are easy to put into practice. Pretty cool, huh?

Get ready to protect your future face and improve your skin’s current health and appearance.

 

Discover our favorite ways to show our DNA who’s boss!

 

Guidance and Topical Ingredients

Conquer Collagen Loss

Collagen and Elastin – they go together like peanut butter and jelly. Collagen (Skin’s #1 structural protein) makes up about 75% of skin and gives your skin flexibility and strength. Elastin helps structure snap back into place, like a rubber band. Collagen loss can begin as early as our twenties. (We know, yikes!)

CAUSES

  1. Genetics
  2. Excess Sun Exposure
  3. Pollution
  4. Gravity
  5. Poor Diet (Excess Sugar, Salt, and Alcohol
  6. Smoking
  7. Rapid Weight Loss

 

Boosts for Everlastin’ Elastin + Collagen

Although we haven’t figured out how to invent the time machine (yet), we do have some gravity-defying tricks up our sleeves for improving elasticity loss. Find products with these helpful ingredient categories. CLICK HERE

    • Peptides that Lift ,Moisturize & Tighten
    • Vitamins that Renew, Nourish & Protect
    • Humectants that Smooth, Plump & Hydrate
    • Exfoliators that Deeply Renew
    • Antioxidants that Perfect, Plump & Prevent Damage
    • Fatty Acids that Nourish, Moisturize & Induce a Glowing Complexion
    • Sun & Blue Light Protection that Prevents Damage

Ingredient Shortlist

  • Beta Glucan: Promotes collagen synthesis and skin elasticity
  • Centella Asiatica: Promotes cell growth factors to help maintain skin elasticity
  • DMAE Bitartrate: Provides firming benefits to skin beginning to lose elasticity
  • Lipoic Acid: Reduces enzymes responsible for elasticity breakdown
  • White or Green Tea Extract: Reduces enzymes responsible for elasticity breakdown
  • Vitamin E (a-tocopherol form): Protects collagen by reducing enzymes responsible for elasticity breakdown
  • Vitamin C 15%+: Increases the synthesis of collagen in the skin
  • Vitamin E (a-tocopherol form): Increases collagen production
  • Alpha Lipoic Acid (ALA): Promotes collagen synthesis and reduces the visible effects of skin aging
  • Retinyl Palmitate: Helps shed the upper dermal layer of skin and helps the skin produce more cells
  • Peptides: Jumpstarts the body into producing more collagen
 

Fine lines and wrinkles are actually perfectly common and across a wider range of ages than many might assume! Thankfully, there are several pro and at-home effective solutions in the war against wrinkles.

WHAT CAUSES GLYCATION WRINKLES?

  1. Genetics

  2. Reduced Genetic Ability to Efficiently Breakdown Glucose

  3. High Sugar Diet
  4. Pollution
  5. Oxidative Stress Caused By UV Exposure

 

WRINKLE WARRIORS

Ward off premature aging with these topical ingredients! TAKE PREVENTATIVE ACTION and discover products that use helpful ingredients. CLICK HERE

  • Peptides that Lift, Moisturize & Tighten
  • Vitamins that Renew, Nourish & Perfect
  • Humectants that Smooth, Plump & Hydrate
  • Exfoliators that Deeply Renew
  • Antioxidants that Perfect, Plump & Prevent Damage
  • Fatty Acids that Nourish, Moisturize & Make Skin GLOW!
  • Sun & Blue Light Protection that Prevents Damage
 

INGREDIENT SHORTLIST

  • Blueberry Extract: breaks down glycation bonds
  • Glycolic Acid: treats the signs of glycation
  • Hyaluronic Acid: helps reduce the appearance of wrinkles and fine lines
  • Kombucha: slows glycation bonding
  • Lactic Acid: treats surface signs of fine lines and wrinkles
  • Vitamin B6 (Pyrudixube): prevents the formation of glycation end-products
  • Algae Extract: minimizes cellular and tissue damage†

†NOTE: if you have any Thyroid Condition, you should contact your doctor before adding products with this ingredient to you skincare routine. Ingredients high in iodine maybe be unsuitable for you to use.

Meet melanin, a natural skin pigment that may help protect the body from harmful UV rays. The amount of melanin your body makes depends entirely upon your genes, and when you are exposed to the sun, your body can respond more. Unfortunately, for some of us, our bodies cannot make enough or make too much.

 

Brilliant Brighteners

Here are our favorite effective, natural, and above all safe brightening agents that both even and restore uneven skin tone. Find products with these helpful ingredient categories.

  • Peptides that Perfect & Restore
  • Vitamins that Nourish & Brighten
  • Hero Herbs & Superfoods that Brighten & Renew
  • Chemical & Physical Exfoliators that Deeply Renew
  • Amino Acids that Prevent Damage
  • Minerals that Purify & Balance

 

INGREDIENT SHORTLIST

  • Grape Seed Extract: Helps skin retain moisture, supports skin barrier function, and has antibacterial and anti-inflammatory effects
  • Hyaluronic Acid: Ideal moisture agent for sensitive skin
  • Resveratrol: Known for antibacterial, anti-acne, and anti-inflammatory properties
  • Algae Extract: Provides a protective barrier for the skin and acts as an anti-inflammatory agent
  • Thyme Extract: Protects against environmental stress, including pollution, and helps calm irritated and inflamed skin
  • Centella Asiatica: Promotes healing and has anti-inflammatory properties

Your yu-nique body has varying degrees of natural UVA and UVB protection. When your skin is exposed to sunlight or blue light, a photochemical process occurs, breaking down UV rays before they cause harm.

CAUSES

  1. Sun Exposure
  2. Genetics

Sunny Saviors

To help guard your skin from harmful UV rays and blue light (from computer screens) find products with sun protection helpful ingredients.

  • Minerals that Provide Physical, Non-Comedogenic Sunscreen
  • Antioxidants that Boost Blue Light, UV-A & UV-B Protection
  • Superfoods that Strengthen Against & Repair Existing UV Damage

Evidence1 shows that incorporating broad-spectrum sunscreen daily can even help slow the skin’s aging process by up to 24%!

1: https://pubmed.ncbi.nlm.nih.gov/27749441/

 

INGREDIENT SHORTLIST

  • Ferulic Acid: Helps restore collagen synthesis after UV exposure
  • Pomegranate: Prevents and reduces sunlight damage (photoaging) after exposure
  • Pine Bark Extract (Pinus pinasta, Pycnogenol): Reduces redness after UV exposure
  • Resveratrol: Helps prevent UV damage to skin
  • Zinc Oxide: Blocks/reduces UV penetration into the skin

Antioxidant production, up until recently, has been an underrated metric in skin aging prevention. However, not only do antioxidants fight against pollution, but they are key in preserving that “je ne sais quoi” essence of glowing, vibrant, youthful-looking skin.

CAUSES

  1. Excess Exposure to Pollution
  2. Genetics
  3. Poor Diet / Vitamin Deficiencies
  4. Poor Sleep
  5. Poor Hygiene

 

Purifying Powerhouses

Here are some of our favorite ingredient categories for chasing those free radicals away. Find them in these great products.

  • Peptides that Lift, Moisturize & Tighten
  • Superfoods that Nourish & Detoxify
  • Power Plants that Induce Glowing Skin & Moisturize
  • Minerals that Purify & Protect
  • Vitamins that Transform & Brighten
  • Chemical Exfoliators that Deeply Renew
  • Physical Exfoliators that Resurface Skin & Refine Pores
 

INGREDIENT SHORTLIST

  • Copper Peptide: Counteracts and neutralizes free radicals
  • CoEnzyme Q10: Protects the mitochondria
  • Grape Seed Extract: Promotes cellular health and protection
  • Green Tea Extract: Free radical scavenger
  • Retinol: Targets and removes cells damaged by free radicals
  • Vitamin C (L-Ascorbid Acid): Counteracts and neutralizes free radicals
  • Vitamin E: Protects agains environmental pollutants

Common questions and concerns from those with sensitive skin:

“Can I use natural ingredients?”

“What ingredients won’t break me out?”

“What if it ruins my date night?”

Don’t worry. We hear you, Sensitives! The guessing game is finally over – here is everything you need to know about how not to get burned again (literally).

CAUSES

  1. Allergic Reactions
  2. Genetics
  3. Dehydration
  4. Environmental Pollution & Particles
  5. Chemical and Active Ingredient Intolerances
  6. Changes in Climate
 

Ingredients to the Rescue!

Below are a few mighty SOS ingredients for Sensitive Skin. Find products with these helpful ingredient categories.

  • Peptides that Combat Redness
  • Superfoods that Soothe & Repair
  • Antioxidants that Calm, Tone & Hydrate
  • Minerals that Purify & Balance
 

INGREDIENT SHORTLIST

  • Centella Asiatica: Suppresses inflamed and acne prone skin
  • Epidermal Growth Factors: Stimulates tissue repair through skin stem cell activation
  • Matrixyl 3000: Helps to replenish skin’s surface and calm visible signs of sensitivity
  • Olive Leaf Extract: Reduces redness and increases vascular flow
  • Vitamin B5: Repairs the skin-barrier and protects agains outside stresses
  • Vitamin E: Anti-inflammatory that helps repair the skin-barrier against outside sresses

Dietary Ingredients and Treatments

Best Collagen Boosting Supplements: Collagen Peptides Powder, Vitamin C, Camu Camu, Acerola Cherry, Hyaluronic Acid, Ginseng, Matcha Green Tea, Astragalus, Ceramides, Amla Berry, Amino Acids, Protein, Omega-3 Fatty Acids, Kale Extract

 

Uplifting Chicken Kale Caesar Salad

This deliciously decadent, nutrient-dense salad contains all of the building blocks necessary for building elastin – Vitamin C, Omega-3 fatty acids, Protein, and Carotenoids.

Chicken Kale Caesar Salad

*Warning: Always consult with your healthcare provider before starting a new dietary regimen, which includes vitamins and supplements.

Collagen Boosting Slow-Cooker Mexican Soup

Here is one of our favorite shortcuts to having both bone broth and soup without having to make both separately. Did we also mention how delicious it is?

Slow-Cooker Mexican Soup

*Warning: Always consult with your healthcare provider before starting a new dietary regimen, which includes vitamins and supplements.

Try the PRO TreatmentsDIY Facial Massage, and Best At Home Tools and Tips under the Treat Fine Lines & Wrinkles tab. They will do wonders for Renewing Elasticity and Boosting Collagen too!


Professional Treatments

  • PRP Therapy
  • Chemical Peel
  • Nano-infusion or Nano-needling Microcurrent Facial Therapy
  • Microneedling
  • Dermaplaning
  • PiQo4 laser
  • Fractional Laser Skin Resurfacing or Nonablative Skin Rejuvenation
  • Co2 Lift
  • High-Intensity Focused Ultrasound (HiFU) Lift & High-intensity Localized Dynamic Micro-massage (HiLDM)
  • Radiofrequency, Stacked Radiofrequency Therapy, or High-Frequency (neon gas)
  • DermalStem Regeneration
  • Hyaluronic Acid Fillers
  • Vitamin Drip IV Therapy
  • Cryotherapy Liquid Nitrogen Facial (aka “Cryofacials”)

BEST ANTI-AGING SUPPLEMENTAL INGREDIENTS: Collagen Peptides Powder, Vitamin C, Camu Camu, Acerola Cherry, Hyaluronic Acid, Ginseng, Matcha Green Tea, Astragalus, Ceramides, Amla Berry, Vitamin A 

 

Recipe: Slow-Cooker Bone Broth

This firming, nourishing, best-thing-since-sliced-bread recipe is not only delicious but easy to make and extremely affordable.

bone broth

*Warning: Always consult with your healthcare provider before starting a new dietary regimen, which includes vitamins and supplements.

 

 

Professional Treatments

  • PRP Therapy
  • Chemical Peel
  • Nano-infusion or Nano-needling Microcurrent Facial Therapy
  • Microneedling
  • Dermaplaning
  • PiQo4 laser
  • Fractional Laser Skin Resurfacing or Nonablative Skin Rejuvenation
  • Co2 Lift
  • High-Intensity Focused Ultrasound (HiFU) Lift & High-intensity Localized Dynamic Micro-massage (HiLDM)
  • Radiofrequency, Stacked Radiofrequency Therapy, or High-Frequency (neon gas)
  • DermalStem Regeneration
  • Hyaluronic Acid Fillers
  • Vitamin Drip IV Therapy
  • Cryotherapy Liquid Nitrogen Facial (aka “Cryofacials”)
 

BEST SKIN BRIGHTENING SKIN SUPPLEMENT: Vitamin C!

 

Roasted Red Pepper & Sun-Dried Tomato Hummus

Roasted bell peppers and tomatoes are two of the top ten foods highest in Vitamin C, making this hummus a super-charged source and a convenient snack for any time!

Roasted Red Pepper & Sun-Dried Tomato Hummus

*Warning: Always consult with your healthcare provider before starting a new dietary regimen, which includes vitamins and supplements.

 

Professional Treatments

  • PRP Therapy

  • Chemical Peel

  • Nano-infusion or Nano-needling Microcurrent Facial Therapy, Microneedling

  • Dermaplaning

  • PiQo4 laser, Fractional Laser Skin Resurfacing, or Nonablative Skin Rejuvenation

  • Intense Pulsed Light Therapy (IPL Treatment)

  • Dermal Stem Regeneration

  • Vitamin Drip IV Therapy (Vitamin C).

Nourish and GLOW from the Inside Out

Protection From the Inside Out: Forgot your sunscreen today? That’s ok, because Salmon has your back (quite literally). Studies show that sun protection can be increased with something as simple as a daily fish oil supplement2

Mind Your Omegas: Meet Omega-3 and Omega-6.

Think of Omega-3 as the introvert at the party that has trouble speaking up, but when he does, he lights up the whole room.

Now picture Omega-6 as your extreme extrovert friend who has absolutely no trouble socializing the moment she gets in the door. Just a little bit of her extreme personality goes a long way—maybe too far with some of the other guests at the party.

This is how these essential fatty acids are introduced into your system, and most of the time we get way too much Omega-6, but not enough Omega-3. Ideally, we want an omega-3:omega-6 ratio of 1:4 – that is, if you want to keep all the organs in your party..err body, happy. Maintaining this ideal ratio has several other health benefits we won’t get into today, but since we’re on the subject, the key organ this golden ratio protects is your largest one—your skin!  

This can be achieved via supplementation, simple dietary inclusions, and simple dietary avoidances.

Supplements: Vitamin D, Cod Liver Oil, Fish Oil, Krill Oil, Green-lipped mussel oil, ALA (alpha-linolenic acid)

Foods to Incorporate: Cod Liver Oil, Salmon, Coconut Oil, Mackerel, Herring, Oysters, Sardines, Anchovies, Caviar, Flax seeds, Snow Crab, Atlantic Cod, Tuna, Mussels, Broccoli Raab, Spinach, Mangos, Kidney Beans, Green Veggies, Sweet Potato, Grass-fed meat, Wild Game, Hemp Seeds, Chia Seeds

Foods to Avoid (or consume in moderation): Processed Oils, Soybean Oil, Vegetable Oils, Seed Oils, Canola Oil, shortening, hydrogenated oils, corn oil, margarine, sunflower oil, safflower oil, Peanut Oil, Cottonseed oil, Conventional / Grain-fed meats

 

Sunny Sunday Salmon Cakes

This quick, easy, and nutrient-dense salmon recipe is the perfect skin-boosting treat to incorporate once a week.

Salmon Cakes

*Warning: Always consult with your healthcare provider before starting a new dietary regimen, which includes vitamins and supplements.

 

2: https://academic.oup.com/ajcn/article/97/3/646/4571525

 

Best Antioxidant Support Supplements: Vitamin A, Vitamin C, Resveratrol, Selenium, Vitamin K, CoQ10

 

Best Superfoods for Antioxidant Support

We recommend consuming the following in whole food form whenever possible. Not only are their nutrients more bioavailable this way, but exponentially more delicious!

Whole Foods: Pomegranate, Berries (Blackberries, Acai, Goji, & Blueberry, are among the highest), Plums, Dried Fruits, Artichoke, Kale, Cauliflower, Cabbage, Beets, Bell Peppers, Tomatoes, Walnuts, Pecans, Pistachios, Flax Seeds, Sesame Seeds, Beans / Legumes, Dark Chocolate, Coffee

Spices/Herbs: Basil, Green mint, Cinnamon, Cloves, Allspice, Oregano

 

Glow Big or Go Home Antioxidant Packed Smoothie

This smoothie not only contains an astounding amount of some of the best whole food sources of antioxidants but tastes like a decadent dessert. (Go on, have it for breakfast, we won’t judge).

Smoothie

*Warning: Always consult with your healthcare provider before starting a new dietary regimen, which includes vitamins and supplements.

BEST SENSITIVE SKIN SUPPLEMENTSVitamin D, Vitamin K, Vitamin C, Vitamin E, Probiotics

 

Dreamy Creamy Mushroomy Salmon

This delectable salmon recipe is not only “d-lightful” but jam-packed with vitamin D, your sensitive skin’s new best friend.

Creamy Mushroomy Salmon

*Warning: Always consult with your healthcare provider before starting a new dietary regimen, which includes vitamins and supplements.

 

Professional Treatments

  • Low Concentration AHA Chemical Peel, or “Lunchtime Peel”

  • Nano-infusion or Nano-needling Microcurrent Facial Therapy, Shorter Needle Microneedling (0.5mm)

  • Vitamin Drip IV Therapy

  • Cryotherapy, Liquid Nitrogen Facial (aka “Cryofacials”)

  • IPL (Intense Pulse Light) Photofacial, BBL (Broadband Light) Photofacial.

DIY Tools & Tips

Lymphatic Facial Massage MapGreat for Collagen Breakdown, Glycation Wrinkling, and Fighting Free Radicals

Manual lymphatic drainage with fingers: Lymphatic drainage is a type of facial massage designed to boost the body’s own natural draining system. By assisting in the movement of excess toxins, water, fats, and proteins down the lymph vessels and into the nodes, the face is left visibly more lifted, firm, and youthful!

Step 1: Apply treatment oil or cleansing balm of choice. Fingers should not drag but glide easily over the skin with little to no resistance.

Step 2: Follow the directional guide below. Using light pressure, gently massage the face in an upwards and outward motion. Pressure should be not unlike moving a pen across a table. The key is to lift and relax muscles! If redness occurs, lighten the pressure.

Step 3: Finish with a glass of water, herbal tea, or warm broth for added hydration.

What if I’m doing this wrong?

Though a skilled facialist’s techniques are hard to beat, there is comfort in knowing two things:

1. Practice makes perfect! If you have fingers, knuckles, or palm(s), and a face to practice on, you too can be a pro in doing your own facial massages in no time.

2. There are few wrong answers. If you are working in upward and outward motions with light, relaxing amounts of pressure, you are certain to fight against one of the main causes of wrinkles – gravity.

Facial Roller being used by a mixed race woman

Facial Rollers:

Gua Sha: This traditional Chinese healing technique incorporates scraping, rubbing, and massaging motions to improve circulation, lymphatic drainage, and the look of tense, or inflamed facial muscles.

Cupping: Tata X Lure Facial Cupping Set (Tata Harper), Lumin Cupping Set, Province Apothecary Facial Cupping Ritual, Habits Skin Lab Face Cups Kit, Metaskin Face Cups

Laser: Tria Age-Defying Laser, NIRA Skincare Laser

Ultrasonic Scrubber: Vanity Planet Ultrasonic Scrubber, Nurse Jamie Dermascrape

Microdermabrasion: Vanity Planet Exfora, Neutrogena Microdermabrasion System

Radio Frequency: TriPollar STOP Vx

High-Frequency Wands: NuDerma Portable Handheld High-Frequency Skin Therapy Wand Machine w/ Neon

Red Light / Light Therapy: Dr. Dennis Gross SpectraLite, Joovv, Trophy Skin RejuvaliteMD Red Light Therapy, MZ Skin Light-Therapy Golden Facial Treatment Device, Skin Gym Wrinklit LED Mask, CurrentBody Skin LED Light Therapy Mask, Skin Inc Optimizer Voyage Tri-Light Glasses, FOREO UFO Smart Mask Treatment, Solawave Wand, TouchBeauty Halo

Cucumber Ice Cubes

Ice CubesFreeze some cucumber slices, or make your own custom spa water cubes with green tea, whole-leaf aloe juice, and cucumber. Once frozen, glides cubes across the face, focusing on any especially irritated or red areas of the face

Short on time? Try Anne Semonin Express Radiance Cubes pre-packaging ready-to-freeze ice cubes

Facial Rollers: (store in the freezer or plunge in ice water before using) Esarora Ice RollerVanity Planet Face & Body Ice Roller, Circcell Amethyst RollerEarth Harbor Jade Rose Gold Gemstone Facial Roller

Gua Sha: This traditional Chinese healing technique incorporates scraping, rubbing, and massaging motions to improve circulation, lymphatic drainage, and the look of tense or inflamed facial muscles. Try storing your gua sha tools in the fridge or plunging them in ice water before using them for more anti-inflammatory benefits.

Red Light / Light Therapy: Dr. Dennis Gross SpectraLite, Joovv, Trophy Skin RejuvaliteMD Red Light Therapy, MZ Skin Light-Therapy Golden Facial Treatment Device, Skin Gym Wrinklit LED Mask, CurrentBody Skin LED Light Therapy Mask, Skin Inc Optimizer Voyage Tri-Light Glasses, FOREO UFO Smart Mask Treatment, Solawave Wand, TouchBeauty Halo

Caucasian woman using an ultrasonic facial scrubber

Facial Steamers: Aira by Vanity Planet, Droplette Micro-Mist Delivery Device, Dr. Dennis Gross Pro Facial Steamer, Facial Ionic Steamer by Panasonic

Laser: Tria Age-Defying Laser, NIRA Skincare Laser

Ultrasonic Scrubber: Vanity Planet Ultrasonic Scrubber, Nurse Jamie Dermascrape

Microdermabrasion: Vanity Planet Exfora, Neutrogena Microdermabrasion System

Red Light / Light Therapy: Dr. Dennis Gross SpectraLite, Joovv, Trophy Skin RejuvaliteMD Red Light Therapy, MZ Skin Light-Therapy Golden Facial Treatment Device, Skin Gym Wrinklit LED Mask, CurrentBody Skin LED Light Therapy Mask, Skin Inc Optimizer Voyage Tri-Light Glasses, FOREO UFO Smart Mask Treatment, Solawave Wand, TouchBeauty Halo

 


Recipes for Skincare Success!

† Watch for the symbol: These products and ingredients may contain high amounts of iodine. See the iodine warning below before using.

Thyroid Disease Warnings: If you, or someone in your family, are prone to or suspect you might have thyroid disease, we recommend avoiding the use of all of the following ingredients in both skincare and supplements unless otherwise instructed by your healthcare provider:

  • Seaweeds
  • Algaes
  • Kelps
  • Sea Fennel
  • Caviar
  • Himalayan Pink Salt
  • Iodine or Iodinized Ingredients

These ingredients are enormously high in iodine content, a proven, major thyroid disruptor. When applied topically, they can enter the bloodstream.

Resources: https://www.drchristianson.com/the-iodine-controversy/