I spent a month visiting medspas. Eight different locations. Three states. I got Botox in one (occupational hazard — I furrow my brows when I read PubMed). I got a consultation for everything else. And I took notes like the chemist I am.
The range was remarkable. One medspa had a board-certified dermatologist supervising every procedure, pharmaceutical-grade products with lot numbers tracked, and a consultation process that felt like an actual medical appointment. Another had a nurse injector working alone, a vaguely medical-sounding title on the wall, and a Groupon deal that made me question the margin on their filler.
The medspa industry is booming. The evidence behind the treatments is real — for some of them. Here's the honest rundown.
Tier 1: Strong Evidence, Clear Mechanisms
Botulinum Toxin (Botox, Dysport, Xeomin)
The mechanism is clean pharmacology. Botulinum toxin blocks acetylcholine release at the neuromuscular junction, preventing muscle contraction. No contraction, no wrinkle. It's temporary (3-4 months), predictable, and has decades of safety data. A meta-analysis in JAMA Dermatology (PMID: 27557413) confirmed both efficacy and a favorable safety profile for cosmetic use when administered by trained professionals.
What to watch for: dosing matters. Underdosing gives weak results. Overdosing gives you a frozen face. The skill of the injector is the primary variable. Ask how many units they use for specific areas and compare to standard dosing guidelines.
Hyaluronic Acid Dermal Fillers (Juvederm, Restylane)
Hyaluronic acid is a naturally occurring glycosaminoglycan in your skin. Injectable HA fillers restore volume, smooth folds, and enhance contours. The evidence base is extensive — a systematic review in Dermatologic Surgery (PMID: 19076169) confirmed efficacy and safety across multiple formulations and injection sites.
The risk: vascular occlusion. Filler injected into or compressing a blood vessel can cause tissue necrosis or, in rare cases, blindness. This is why anatomical expertise matters more than price. An injector who can name every branch of the facial artery is worth the premium over someone offering filler at a "lip party."
Chemical Peels
Controlled acid application to the skin — glycolic, salicylic, trichloroacetic, or phenol — induces controlled injury, stimulating dermal remodeling and new collagen synthesis. The chemistry is straightforward. The evidence is solid across decades of dermatological literature. A review in Clinical, Cosmetic and Investigational Dermatology (PMID: 20725534) covered the spectrum of peel depths and their evidence-based applications.
Tier 2: Good Evidence, Requires Proper Parameters
Microneedling
Controlled micro-injuries to the dermis using fine needles (0.5-2.5 mm) trigger a wound-healing cascade — collagen synthesis, elastin production, growth factor release. Studies show improvements in acne scars, photoaging, and skin texture. But needle depth, device quality, and technique matter. A 2018 review in Journal of Clinical and Aesthetic Dermatology (PMID: 29942419) found consistent efficacy for acne scarring when needle depth was appropriate for the indication.
The at-home dermaroller your friend uses is not the same treatment. Clinical microneedling at 1.5-2.5 mm depth with a motorized pen device under aseptic conditions is a fundamentally different intervention than rolling a $30 Amazon device across your face at 0.25 mm.
Laser Treatments (Fractional, IPL, Ablative)
Laser resurfacing works through selective photothermolysis — specific wavelengths target specific chromophores (melanin, hemoglobin, water) to address pigmentation, vascularity, or texture. Fractional lasers (Fraxel, Clear + Brilliant) create microscopic treatment zones while leaving surrounding tissue intact, reducing downtime.
The evidence is strong for skin resurfacing, hyperpigmentation, and scar treatment. But device settings, skin type assessment (Fitzpatrick scale), and post-treatment care are critical variables. A poorly calibrated laser on the wrong skin type causes burns, hyperpigmentation, or scarring — the opposite of the intended effect.
Tier 3: Marketing Outpacing Evidence
IV Vitamin Drips (The "Glow" Drip)
I've written about IV therapy separately, but the medspa version deserves special mention. "Glow drips" and "beauty IVs" typically contain vitamin C, biotin, glutathione, and B-vitamins. The premise: bypass the gut for 100% bioavailability. The reality: your kidneys excrete the excess within hours. For most healthy people, this is expensive urine with a nice chair.
Non-Invasive Body Contouring (CoolSculpting, EMSculpt)
CoolSculpting (cryolipolysis) uses controlled cooling to damage fat cells. The evidence shows modest fat reduction — typically 20-25% in the treated area over 2-3 months. Modest. A study in Plastic and Reconstructive Surgery (PMID: 19644271) confirmed statistically significant fat reduction, but the clinical significance for many patients is disappointing relative to cost ($2,000-$4,000 per treatment area).
EMSculpt uses HIFEM (high-intensity focused electromagnetic) energy to force supramaximal muscle contractions. The research shows increased muscle mass and some fat reduction in the treated area. But "increased muscle mass" doesn't mean visible abs if you have a layer of subcutaneous fat over them. Set expectations accordingly.
Red Flags at a Medspa
- No physician oversight. In most states, medspas must have a medical director (MD/DO) who oversees clinical protocols. If you can't identify who that person is, that's a problem.
- Groupon pricing on injectable treatments. Botox costs what it costs. If someone is offering it at 60% off, ask what's being cut — product quality, injector experience, or both.
- Before-and-after photos without consistency. Different lighting, angles, and makeup in before vs. after photos are marketing, not documentation.
- Pressure to buy packages during your first visit. A quality medspa lets results speak. They don't need urgency tactics.
How to Choose a Medspa
At BestDosage, we evaluate medspas on medical director credentials, injector training, treatment menu transparency, pricing clarity, and verified patient reviews. We distinguish between physician-led practices and aesthetician-operated lounges because the clinical oversight difference matters — especially when needles, lasers, and pharmaceuticals are involved.
Browse medspa and aesthetics providers near you →
I'm Chad. Your chemist.