Beef Tallow and the Top 10 TikTok Skincare Trends Science vs. Hype: A Dermatological Analysis of Viral Skincare Sensations

1. Exosome Serums: The Next Generation of Anti-Aging?

Exosome serums have taken TikTok by storm, with users raving about their seemingly miraculous anti-aging and skin-rejuvenating properties. These tiny extracellular vesicles derived from stem cells are being hailed as the next breakthrough in skincare technology.

Exosomes function as cellular messengers, transferring genetic information and proteins between cells. In skincare, they're purported to deliver regenerative signals that stimulate collagen production, improve cellular repair, and enhance overall skin health. TikTok creators showcase dramatic before-and-after transformations, claiming reduced wrinkles and improved skin texture after just a few weeks of use.

While the theoretical basis for exosome technology is promising, dermatologists remain cautiously optimistic. Dr. Anjali Mahto, a consultant dermatologist, notes that "the science behind exosomes is fascinating, but we're still in the early stages of understanding their full potential in topical skincare applications." Clinical studies have shown promising results for wound healing and tissue regeneration, but comprehensive research specifically on anti-aging benefits remains limited.

The consensus among dermatologists is that while exosome technology holds promise, the current products on the market vary widely in quality and concentration. If you're curious about trying this trend, look for products from reputable brands that provide transparency about their exosome sourcing and concentration—and maintain realistic expectations about results.

2. Red Light Therapy Devices: At-Home Professional Treatments?

Red light therapy devices have gained massive popularity on TikTok as users showcase their at-home treatments for everything from acne to wrinkles. These devices emit low-level red light wavelengths (typically 630-700nm) that purportedly penetrate the skin to stimulate cellular repair and rejuvenation.

The science behind red light therapy is actually quite solid. Research published in the Journal of Clinical and Aesthetic Dermatology confirms that specific wavelengths can stimulate mitochondria in skin cells, increasing energy production and promoting healing. Clinical studies have demonstrated improvements in skin texture, reduced inflammation, and increased collagen production with consistent use.

Dr. Whitney Bowe, board-certified dermatologist, explains: "Red light therapy has legitimate benefits when used correctly and consistently. The key is using devices with the proper wavelength and power output." However, she cautions that many consumer devices may not deliver the same intensity as professional equipment.

For those interested in trying this trend, dermatologists recommend looking for FDA-cleared devices with clearly stated wavelengths and power outputs. Consistency is crucial—most studies showing benefits used treatments 3-5 times weekly for at least 4-12 weeks. While not a miracle cure, this is one TikTok trend with substantial scientific backing.

3. Glass Skin: K-Beauty's Dewy Perfection

The "glass skin" trend, originating from Korean beauty traditions, has captivated TikTok with its promise of ultra-smooth, reflective, poreless-looking skin with even Kylie Jnner jumping in. This multi-step approach focuses on intense hydration, gentle exfoliation, and layering lightweight products to achieve a translucent, dewy complexion.

Dermatologists generally approve of the philosophy behind glass skin routines. Dr. Shereene Idriss explains, "The emphasis on hydration, gentle exfoliation, and barrier protection aligns well with dermatological principles for healthy skin." The layering technique helps deliver hydration at different levels of the skin, while the focus on gentle, consistent care promotes long-term skin health.

The scientific evidence supports many aspects of this trend. Hyaluronic acid, a key ingredient in many glass skin routines, has been clinically proven to improve skin hydration and elasticity. Regular, gentle exfoliation helps remove dead skin cells that can dull complexion, while barrier-supporting ingredients help maintain skin health.

However, dermatologists caution that the extensive multi-step routines showcased on TikTok may not be necessary or suitable for everyone. Dr. Adeline Kikam notes, "While the principles are sound, a simplified version with quality products can achieve similar results without overwhelming the skin or your schedule."

For those interested in achieving glass skin, focus on the core principles: thorough but gentle cleansing, hydration at multiple levels, and consistent sun protection. Adapt the routine to your specific skin needs rather than following every step showcased in viral videos.

4. Simplified Multi-Tasking Skincare: Less Is More

In a refreshing countertrend to elaborate multi-step routines, simplified multi-tasking skincare has gained significant traction on TikTok. This approach emphasizes fewer, more effective products that serve multiple purposes, streamlining routines while maintaining results.

The scientific rationale for simplification is compelling. Research published in the Journal of Cosmetic Dermatology suggests that using too many active ingredients simultaneously can compromise the skin barrier and increase sensitivity. Dermatologists have long observed that complex routines often lead to inconsistent use and potential ingredient conflicts.

Dr. Ranella Hirsch, a board-certified dermatologist, endorses this trend: "I've always advocated for simplicity in skincare. Multi-tasking products with proven ingredients at effective concentrations can deliver excellent results without overwhelming the skin." She recommends focusing on cleansing, treatment, moisturizing, and sun protection as the core steps.

The key to successful simplified skincare is choosing products with complementary, well-researched ingredients at effective concentrations. Look for products that combine hydration with targeted treatments, such as moisturizers with niacinamide or sunscreens with antioxidants. This approach is particularly beneficial for those with sensitive skin or busy lifestyles.

Dermatologists agree that this is one TikTok trend worth embracing, as it promotes sustainable skincare habits and reduces the risk of irritation from ingredient overload. The focus on quality over quantity aligns with evidence-based skincare principles and often leads to better long-term results.

5. Barrier Repair Products: Rebuilding Skin's Natural Defense

Barrier repair products have surged in popularity on TikTok as users become more aware of the importance of a healthy skin barrier. These formulations focus on replenishing the skin's natural lipids and supporting its protective function against environmental stressors and moisture loss.

The science behind barrier repair is well-established in dermatology. Research published in the Journal of Clinical and Aesthetic Dermatology confirms that barrier-supporting ingredients like ceramides, fatty acids, and cholesterol can effectively restore compromised skin. Clinical studies show that a 3:1:1 ratio of these components closely mimics the skin's natural lipid structure and optimizes barrier function.

Dr. Julie Fridlington of Alamo Heights Dermatology rates skin barrier repair as "a solid 5 for glow-up potential" on a scale of 0-5. She explains, "When the barrier is compromised, skin becomes more susceptible to irritation, inflammation, and accelerated aging. Restoring it addresses the root cause of many skin concerns."

For those interested in this trend, dermatologists recommend looking for products containing ceramides, cholesterol, fatty acids, niacinamide, and hyaluronic acid. The most effective formulations balance lipid replenishment with hydration and gentle, non-stripping cleansing. This approach is particularly beneficial for those with sensitive, reactive, or eczema-prone skin.

Unlike many TikTok trends, barrier repair represents a fundamental approach to skincare that aligns perfectly with dermatological principles. It's less about flashy results and more about creating the optimal foundation for healthy, resilient skin in the long term.

6. Electrolyte-Infused Skincare: Sports Drinks for Your Face?

Electrolyte-infused skincare has emerged as a buzzy TikTok trend, with products claiming to hydrate skin using the same minerals (potassium, sodium, calcium, and magnesium) that replenish the body after exercise. These formulations promise to enhance moisture retention and improve overall skin hydration.

The theoretical basis for electrolytes in skincare makes some sense. Dr. Bruce Robinson, FAAD, explains, "In the skin, electrolytes help conduct electricity when mixed with water, enabling cells to regulate pH levels and keep the body's hydration system in check." The minerals can potentially help skin retain water and improve cellular function.

However, dermatologists remain skeptical about the practical benefits. Dr. Ife J. Rodney notes, "When water or electrolytes are applied topically to the skin, they evaporate very quickly." For electrolytes to potentially penetrate and reach deeper skin layers, they need to be linked to skin-identical molecules like lactate, gluconate, or pyroglutamic acid (PCA).

The scientific evidence for electrolyte skincare remains limited, with few independent clinical studies demonstrating significant benefits over traditional hydrating ingredients. Most dermatologists view these products as potentially beneficial but not revolutionary, suggesting that consumers look for formulations that combine electrolytes with proven hydrators like hyaluronic acid, glycerin, and ceramides.

If you're curious about this trend, dermatologists recommend maintaining realistic expectations and prioritizing products with additional evidence-based ingredients rather than focusing solely on the electrolyte content.

7. Beef Tallow Moisturizers: Ancient Remedy or Modern Mistake?

One of the more controversial skincare trends on TikTok involves using beef tallow—rendered beef fat—as a facial moisturizer. Proponents claim it's a "natural" alternative to commercial products, with superior moisturizing properties and skin-healing benefits.

The scientific evidence for beef tallow in skincare is extremely limited. A 2024 scoping review published in Cureus found significant research gaps regarding tallow's use on human skin, with most published evidence lacking human subjects. While tallow does contain some fat-soluble vitamins (A, D, E, K) and fatty acids similar to those in human sebum, this doesn't necessarily translate to proven skincare benefits.

Dermatologists overwhelmingly advise against this trend. Dr. Ava Shamban states, "There is still little clinical or scientific evidence that beef tallow is actually beneficial for use on skin or in skin care." Multiple board-certified dermatologists interviewed by Allure magazine gave beef tallow a "hard pass," citing concerns about comedogenicity, contamination risks, and potential sensitization.

Dr. Maya Thosani warns, "Tallow is highly comedogenic and pore-clogging, so it will likely cause acne despite claims that it won't." Additionally, the distinctive meaty smell and ethical concerns about animal-derived products make this trend problematic for many users.

For those seeking natural moisturizing alternatives, dermatologists recommend plant-based oils with better research support, such as sunflower seed oil, jojoba oil, or squalane. These options provide similar emollient benefits without the risks associated with animal fats.

8. Scar Care Products: Targeted Solutions for Visible Results

Scar care has emerged as a significant TikTok skincare trend, with users sharing various treatments and techniques to reduce the appearance of scars from acne, surgery, or injuries. Products range from silicone sheets and gels to specialized serums and exfoliants.

The scientific evidence strongly supports certain aspects of this trend, particularly silicone-based products. Clinical studies confirm that silicone sheets and gels can effectively flatten and soften raised scars, especially hypertrophic and keloid types. The mechanism involves occlusion and hydration of the stratum corneum, which helps normalize collagen production in the healing process.

Research published in Dermatology Times also supports the use of adapalene 0.3%/benzoyl peroxide 2.5% gel for preventing and reducing atrophic acne scars. This prescription-strength combination has shown efficacy in clinical trials for improving scar appearance when used early in the healing process.

Dr. Corey L. Hartman, board-certified dermatologist, explains: "Early intervention is key with scars. The best time to treat a scar is before it fully forms, when the tissue is still red or pink and actively remodeling." He recommends silicone as a first-line treatment for most scar types, with additional professional treatments like laser therapy or microneedling for more significant scarring.

For those following this trend, dermatologists emphasize the importance of consistency, sun protection, and realistic expectations. While complete scar removal is often not possible, significant improvement can be achieved with evidence-based approaches and patience.

9. Kids/Teen-Specific Skincare: Too Much Too Soon?

The rise of skincare routines specifically marketed to children and teenagers has become a controversial trend on TikTok, with young influencers as young as 9 years old promoting elaborate multi-step regimens. This phenomenon, sometimes called the "Sephora Kids" trend, has raised concerns among dermatologists and parents alike.

From a scientific perspective, children's skin differs significantly from adult skin. It has a higher cell turnover rate, more efficient natural exfoliation, and different sebum production levels. Dr. Abigail Waldman of Brigham and Women's Hospital explains, "When you are a kid, everything in your skin is working perfectly. It has a mechanism in place to exfoliate, to turn over, to do all the things it's supposed to do, and so you don't need any expensive fancy skincare."

Dermatologists are particularly concerned about children using products containing potent active ingredients designed for adult skin. Dr. Waldman warns, "Products with retinol and glycolic acid can be quite irritating, leading to rash and even hyperpigmentation if you're using them too often or getting sun afterwards."

The consensus among skin experts is that for most pre-teens, a simple routine consisting of a gentle cleanser, basic moisturizer, and sunscreen is sufficient. Teenagers with specific concerns like acne may benefit from targeted treatments, but should ideally consult with a dermatologist rather than following TikTok trends.

Dr. Whitney Bowe recommends that parents guide their children toward age-appropriate products and emphasize the importance of sun protection rather than complex anti-aging or treatment-focused routines that may actually damage developing skin.

10. Clean/Non-Toxic Beauty: Marketing or Meaningful?

The clean and non-toxic beauty movement has gained tremendous momentum on TikTok, with influencers promoting products free from ingredients deemed "harmful" or "toxic." This trend emphasizes skincare that avoids certain components like parabens, sulfates, phthalates, and synthetic fragrances.

The scientific perspective on clean beauty is nuanced. While some excluded ingredients have shown potential for hormone disruption in laboratory settings (like certain parabens and phthalates), the evidence for harm at the concentrations used in cosmetics remains limited. Research on fragrance allergies is more established, confirming that synthetic fragrances can cause contact dermatitis in sensitive individuals.

Dr. Dendy Engelman offers a balanced view: "Just because a product is made in a lab, doesn't necessarily mean it's bad. And just because a product comes from ingredients found in nature, doesn't necessarily mean it's good." She uses the example of poison ivy—completely natural but certainly not beneficial for skin.

The regulatory context is important to understand—the terms "clean" and "non-toxic" have no standardized definitions or oversight in the beauty industry. Each brand establishes its own criteria, leading to inconsistent standards across products labeled as "clean."

Dermatologists generally recommend focusing on individual ingredients and their effects rather than broad "clean" claims. Dr. John Burroughs suggests looking for evidence-based formulations rather than marketing terminology, and understanding that preservatives serve an important safety function in preventing bacterial growth.

While the clean beauty movement has positively influenced the industry by increasing transparency and options for sensitive skin, claims should be evaluated critically rather than accepted at face value.