The skincare industry has seen countless trends come and go, but few have emerged with the scientific foundation that Symbiome brings to the conversation. Founded in 2017 by Larry Weiss, MD, this San Francisco-based company has positioned itself at the intersection of microbiome science and luxury skincare, promising to restore what modern living has taken from our skin's natural ecosystem.
But does the science hold up? And more importantly, do the products deliver results that justify their premium price points? This comprehensive review examines everything consumers need to know about Symbiome before investing in their skincare routine.
What Is Symbiome and Who Founded the Company?
Symbiome was founded by Larry Weiss, MD, a physician with an impressive background in microbiome science and natural products chemistry. Dr. Weiss holds an MD from Stanford University and a BS in Biochemistry from Cornell University, bringing decades of experience in microbiology, clinical medicine, and skincare product development to the brand.
Before launching Symbiome, Dr. Weiss served as the Founding Chief Medical Officer at AOBiome, where he helped develop Mother Dirt products, including what the company describes as the first live skin probiotic. He also founded CleanWell Company earlier in his career, demonstrating a consistent focus on developing products that work with the body's natural systems rather than against them.
Co-founder and CEO Vicki Levine brings direct-to-consumer expertise and business acumen to the operation. Together, they've built a team that includes microbiome scientists, microbiology PhDs, and medical professionals engaged in ongoing research and product development.
The company raised $15 million in funding from investors including True Ventures, Bold Capital Partners, Mission Bay Capital, and Gisev Family Office, signaling confidence from the investment community in both the science and the business model.
The Ancestral Microbiome Theory: Understanding Symbiome's Core Philosophy
Symbiome's entire product philosophy centers on what they call the “ancestral microbiome” — the idea that human skin once hosted a far more diverse and functional microbial ecosystem than it does today.
According to Symbiome's research, modern industrialized living has resulted in approximately 80% loss of microbial diversity on the skin, along with roughly 25% reduction in metabolic function. The brand attributes this loss to factors including modern hygiene practices, environmental changes, dietary shifts, and reduced contact with natural environments.
The theory draws from comparative studies of populations living in pre-industrialized conditions versus modern urban dwellers. Researchers have observed that indigenous populations living traditional lifestyles tend to have more diverse skin microbiomes and lower rates of inflammatory skin conditions such as acne, eczema, rosacea, and psoriasis.
Dr. Weiss has noted in interviews that ancient humans had a “modal age of death” similar to modern populations, but achieved this without the pharmaceutical interventions contemporary society relies upon. The implication is that a healthier microbiome contributed to overall resilience and reduced disease burden.
Whether one fully accepts this evolutionary framework or not, the underlying science of microbiome health is well-established in dermatological research. The skin microbiome does play a documented role in barrier function, immune response, and protection against pathogens.
Key Ingredients and Proprietary Technologies
Symbiome has developed several proprietary ingredient technologies that distinguish their products from competitors in the microbiome skincare space.
Postbiomic™ Ferments
The brand's signature technology involves precision fermentation of sustainably harvested Amazon rainforest botanicals. Unlike probiotics (live microorganisms) or prebiotics (food for microorganisms), postbiotics are the beneficial byproducts and metabolites produced by microbial fermentation.
Symbiome ferments their botanical ingredients using microbes derived from each plant's own microbiome, which they claim unlocks the full spectrum of beneficial biomolecules. This process is designed to deliver vitamins, nutrients, and essential fatty acids in forms that the skin can readily utilize.
Stem Cell Conditioned Media (SCCM)
The brand's STEMWEAR™ collection features Adult Adipose Stem Cell Conditioned Media as a hero ingredient. This is not the stem cells themselves, but rather the nutrient-rich broth produced when stem cells are cultured — containing peptides, growth factors, exosomes, and cytokines.
Symbiome sources their SCCM from a live culture of human adipose (fat) stem cells, derived from a single healthy adult volunteer in California. The donor undergoes screening for genetic disease markers, with oversight from registered independent Medical Institutional Review Boards. Manufacturing occurs under cGMP conditions at an FDA-compliant facility.
The Answer Reparative Serum contains 50% SCCM, which the brand states is a higher concentration than competing products in this category. Stem cell conditioned media has been the subject of clinical research spanning over 40 years, initially investigated for wound healing and scar reduction applications before expanding into cosmetic use.
BioIntact™ Formulations
Symbiome emphasizes keeping ingredients biologically intact throughout their formulation process. Rather than isolating individual compounds, they preserve the complete molecular profiles of their botanical ingredients, arguing this delivers benefits more aligned with how these compounds function in nature.
Amazon Rainforest Botanicals
The brand sources ingredients from the Brazilian Amazon, partnering with sustainable harvesting operations. Key botanicals include Cumaru Seed Oil (rich in antioxidants, vitamins E and K, ferulic and chlorogenic acids, naturally occurring retinoids, and coumarin), Sanoma Leaf Oil (containing lipids, phytosterols, vitamin E, and thymol), Buriti Fruit Oil, and Breu Resin.
Complete Product Line Overview
Symbiome maintains a deliberately streamlined product lineup, adhering to what they call their “Less Than 10” promise — each product contains fewer than 10 clean, organic, traceable ingredients.
Cleansers
The Renewal Daily Cleanser ($60) — A rich, hydrating oil-based gel cleanser designed for daily use. Formulated to cleanse without stripping the skin's natural oils or disrupting the microbiome.
The Reset Clarifying Cleanser ($45) — A clarifying option for those dealing with congestion or excess oil production.
Serums
The Answer Reparative Serum ($200) — The brand's hero product and bestseller. Contains 50% Stem Cell Conditioned Media along with Lactobacillus Ferment, Caesalpinia Spinosa Gum, Geranium Leaf Oil, and Breu Resin. Targets fine lines, wrinkles, dark spots, and overall skin texture. The fast-absorbing, water-based formula is designed for all skin types, with particular benefits for maturing or textured skin.
The Solution Firming Neck & Décolleté Serum (NEW) — The newest addition to the STEMWEAR™ collection, also formulated with 50% SCCM but specifically designed for the thinner, more delicate skin of the neck and chest area. Addresses concerns including “tech neck” lines, loss of firmness, and crepiness.
Moisturizers
The One Restorative Cream ($125) — A moisturizing and barrier-replenishing cream designed to seal in the benefits of serums while providing all-day hydration.
The Luminary Replenishing Eye Cream ($150) — Targets the delicate eye area with formulations designed to address fine lines, puffiness, and dark circles.
Mists
The Essence Rejuvenating Mist ($50) — Contains 10% SCCM along with proprietary Postbiomic™ microbial lysates and enzymes. Can be used as a toner, setting mist, or hydration boost throughout the day. The formula is designed to provide antioxidant protection and surface-level renewal.
Face Oils
Symbiome offers four Postbiomic™ Face Oils, each targeting different skin concerns:
Rebalance001 Firming Postbiomic Face Oil ($85) — Designed for firming and tightening benefits.
Recharge002 Revitalizing Postbiomic Face Oil ($85) — Focused on revitalization and energy restoration.
Rewind003 Age-Defying Postbiomic Face Oil ($85) — Targets signs of aging with naturally occurring retinoids and brightening compounds from Cumaru Seed Oil.
Respond004 Soothing Postbiomic Face Oil ($85) — Formulated for sensitive or reactive skin types.
Sets and Bundles
The STEMWEAR™ Set — Includes The Answer, The Solution, and The Essence for comprehensive stem cell media treatment.
The Stemwear Essentials — The Answer and The Solution duo for face and neck.
The Supple Skin Set — Combines The Answer with Rewind003 for anti-aging benefits.
Certifications and Third-Party Validations
Symbiome has accumulated an impressive roster of third-party certifications that speak to their commitment to safety, sustainability, and ethical practices.
EWG Verified — The Environmental Working Group's verification program applies what the organization describes as the strictest scientific standards available for chemical safety, backed by over 25 years of research expertise.
MADE SAFE Certified — This certification validates that products are made without known toxic chemicals and are safe for human health and ecosystems.
Leaping Bunny Certified — The gold standard for cruelty-free certification, validating that no animal testing was conducted at any phase of product or ingredient development. Participating companies must open their processes to independent audits throughout the supply chain.
1% For the Planet — Symbiome pledges 1% of sales to environmental organizations annually.
Amazon Conservation Team Partnership — The brand partners with this nonprofit organization to conserve rainforest biodiversity and protect the culture and land of indigenous guardians in the regions where they source ingredients.
How to Use Symbiome Products: Recommended Routine
Symbiome recommends layering products from thin to thick, or from water-based to oil-based formulations, to maximize absorption and efficacy.
Morning Routine:
- Cleanse with The Renewal or The Reset
- Mist with The Essence
- Apply 3-4 drops of The Answer to face
- Apply The Solution to neck and décolleté
- Apply eye cream if using
- Finish with The One cream
- Optional: seal with a few drops of appropriate Postbiomic Oil
Evening Routine:
Follow the same sequence. The brand notes that their products are compatible with prescription retinoids and other active ingredients like ascorbic acid and AHA/BHA treatments.
For post-procedure use, the STEMWEAR™ collection is positioned as complementary to microneedling, laser treatments, and chemical peels, potentially accelerating recovery and enhancing results.
What Do Consumers Say? Analyzing Customer Feedback
Customer reviews for Symbiome products, particularly The Answer serum, tend to be polarized — reflecting both the premium price point and the variable nature of skincare results.
Positive feedback commonly mentions:
- Noticeable improvement in skin texture and smoothness
- Enhanced hydration without heaviness
- Visible reduction in fine lines over time
- Compatibility with sensitive skin types
- Appreciation for the minimal ingredient lists
- Products absorbing quickly without residue
Critical feedback includes:
- Price point being prohibitive for regular use
- Some users experiencing breakouts, particularly during initial use
- Results taking longer than expected to manifest
- Natural scent profiles not appealing to all users
- Desire for larger product sizes
The brand notes that because they use natural ingredients, some variation in scent and color between batches is normal and should be expected.
Consumer perception studies conducted by the brand show positive results, though these typically involve smaller sample sizes (for example, 22 healthy volunteers in one cited study) rather than large-scale clinical trials.
Symbiome vs. Other Microbiome Skincare Brands
The microbiome skincare category has grown significantly, with brands including Mother Dirt (where Dr. Weiss previously worked), Tula, Biossance, and others competing for consumer attention.
What distinguishes Symbiome:
- Founder credentials in microbiome science specifically
- Focus on postbiotics rather than live probiotics
- Integration of stem cell conditioned media
- Extremely minimal formulations (fewer than 10 ingredients per product)
- Sustainability focus with Amazon sourcing
- Premium positioning with corresponding price points
Potential considerations:
- Higher price point than many competitors
- Smaller product sizes
- The Answer serum is not vegan due to human-derived SCCM
- Limited retail availability compared to mass-market microbiome brands
Who Is Symbiome Best Suited For?
Based on the product formulations, pricing, and brand positioning, Symbiome appears best suited for:
- Consumers prioritizing clean, minimal-ingredient skincare
- Those interested in science-backed approaches to skin health
- People with maturing skin seeking anti-aging benefits
- Individuals with sensitive skin who react to complex formulations
- Environmentally conscious consumers who value sustainability certifications
- Those willing to invest in premium skincare products
The brand may be less ideal for:
- Budget-conscious consumers seeking value-oriented options
- Strict vegans (due to SCCM in certain products)
- Those seeking immediate, dramatic results
- Consumers who prefer heavily fragranced products
Potential Concerns and Considerations
Price Accessibility — With individual products ranging from $45 to $200, a complete Symbiome routine represents a significant investment. The Answer serum alone costs $200 for 30mL.
Limited Clinical Data — While stem cell conditioned media has decades of research behind it, Symbiome's specific formulations have primarily been validated through consumer perception studies rather than large-scale clinical trials published in peer-reviewed journals.
Vegan Status — The brand accurately notes that all products except The Answer serum are vegan. Consumers should be aware that SCCM-containing products involve human-derived ingredients.
Shelf Life — Unopened cleansers, creams, and serums have a 12-month shelf life; oils last 2 years. Once opened, the brand recommends using products within 3-6 months.
The Bottom Line: Is Symbiome Worth It?
Symbiome represents a thoughtful, science-informed approach to skincare that prioritizes working with the skin's natural systems rather than overwhelming them with extensive ingredient lists. The brand's credentials, certifications, and sustainability commitments are genuine differentiators in a crowded market.
For consumers who have struggled with reactive skin, who are skeptical of products with lengthy ingredient lists, or who are drawn to the emerging science of the skin microbiome, Symbiome offers a compelling option backed by legitimate expertise.
The premium pricing will understandably be a barrier for many. However, the brand's philosophy of minimal formulations means that individual products may last longer than competitors with more liberal application instructions.
Those considering Symbiome would be wise to start with a single product — perhaps The Essence mist at $50 for a lower-commitment entry point, or The Answer if anti-aging is the primary concern and budget permits.
As with any skincare investment, individual results will vary based on skin type, existing routine, consistency of use, and numerous other factors. What Symbiome offers is a well-researched, carefully formulated approach to skin health that aligns with emerging understanding of the microbiome's role in dermatological wellness.
The brand's commitment to transparency, sustainability, and scientific rigor sets a standard that the skincare industry could benefit from following more broadly — regardless of whether their specific formulations become part of your personal routine.