I use the botanical herb comfrey in my salon. Not in a serving of tea, in a product, on actual clients. My blondes, my color-treated regulars, the people whose hair takes the most damage from bleach and repeated chemical processing. I reach for it specifically because of what it does to stressed tissue. That is not a marketing angle. That is twenty plus yyears of watching what works, on real hair, under real conditions.
So when it came time to build the herbal infusion inside Sundae Glow, comfrey was never a question. The question was what to build around it. Rosehip, calendula, and dandelion each earned their place the same way: backed back research and urban herbalist wisdom.
Comfrey: the compound doing the work
Comfrey's healing reputation comes down to one compound: allantoin. It occurs naturally in the plant, and it has been studied far more rigorously than most people expect. A review published in the Journal of the American Academy of Dermatology drew on roughly 130 preclinical and clinical studies and found that allantoin helps move skin out of a stalled inflammatory state and into active repair, promoting cell proliferation, tissue rebuilding, and the transition from wound to healed skin.
A separate study applying comfrey extract directly to skin, published on PubMed, documented visibly faster regeneration of skin cells, with normal skin structure reforming within four to seven days. That kind of measured, photographed recovery is why this plant has been used in healing traditions for centuries, and why it holds up when placed under a microscope.
Comfrey's healing speed is exactly why herbalists caution against applying it to deep puncture wounds. It can close the surface faster than the tissue underneath is ready, which risks sealing in what shouldn't be sealed. That caution applies to raw, open wounds. Everyday use on skin and hair, the way we use it in the formula and the way I use it in the salon, is a different matter entirely.
Four plants, each earning their place on their own research.
Rosehip: collagen and tone
Rosehip is one of the most studied botanicals in skin care, and for once the reputation is backed up. A review of rosehip-based dermatological products published in Frontiers in Pharmacology found evidence supporting its role in collagen synthesis, wound healing, and reducing hyperpigmentation, melasma, and signs of photoaging. Rosehip is rich in vitamins A and C, which together address both the structural integrity of the skin and the uneven tone that builds up over years of sun exposure.
In a bronzing oil designed to enhance how the skin catches and holds light, an ingredient actively working on tone and texture is doing double duty. That kind of layering is the whole point of building a formula this way.
Calendula: calm and moisture retention
Calendula has one of the longest track records in skin care of any botanical on this list, and the research tells you why. A study on calendula flower extract found it measurably suppressed key inflammatory markers in skin cells, producing a documented anti-inflammatory effect at the cellular level. Calendula has also been studied for its support of the skin's moisture barrier, helping skin hold onto water rather than lose it throughout the day.
For a formula meant to be worn daily, calming and moisture-retaining together matter more in the long run than most ingredients with bigger names. The skin you wear every day benefits more from consistent support than from occasional intervention.
Dandelion: the quiet one
Dandelion tends to get passed over. It doesn't have rosehip's market presence or comfrey's centuries-long reputation. But the research is real. A study published in Oxidative Medicine and Cellular Longevity found that dandelion extracts protected human skin fibroblasts from UVB damage and premature cellular aging. Dandelion is also dense in vitamins A, C, and E, which collectively support the skin's antioxidant defenses and nourish at the barrier level rather than just sitting on top of it.
Alongside comfrey, rosehip, and calendula, dandelion completes an infusion where every ingredient is doing something that matters, not just occupying space on the label.
Why this infusion is in a bronzing oil
A treatment-grade herbal infusion doesn't usually show up in a shimmer product. The kind of ingredient list you'd expect in a serum, not something you reach for on the way out the door. But Sundae Glow was built to be worn daily, all over the body, the way you'd apply a lotion. If it's going on your skin every day, the base it's carried in should be doing real work.
That's the premise behind putting a healing infusion, the same one I trust professionally in a salon setting, into an everyday glow oil. Pair it with Creme Brulee body polish, which carries some of the same botanical threads, for the full Polish and Glow routine. The full story of how Sundae Glow is built and what makes it different starts in Golden Hour in a Bottle.
Formulator's Notes: straight answers from 25+ years behind the bench.
