A Private Practice for Aesthetic Medicine
Where aesthetic medicine meets longevity and clinical refinement.
From the moment you step into Longevity Lab & Aesthetics, care becomes intentional. Our approach is grounded in aging biology—integrating skin health, facial structure, metabolism, and internal balance into individualized clinical plans. Nothing here is rushed or trend-driven; every decision is made to support natural results that evolve with you over time.
welcome to
Longevity Lab & Aesthetics
Longevity Lab & Aesthetics, an elegant med spa in Newton, MA, is a destination for anyone wishing to feel their best. You don’t have to decline as you age. Instead, it can be a time to thrive, with the proper support.
We combine modern medical knowledge with natural, approachable aesthetic treatments to care for the whole you, from the inside out. Every person who visits us is unique, so we take the time to get to know your goals, understand your concerns, and build a plan that feels right for you. Whatever your question about skin treatment, stress management, or aging with confidence, we are here to guide and never rush you.
what we do
Compassionate. Experienced. Patient-Centered Care.
meet our founder
Marni Smith is a board-certified Family Nurse Practitioner licensed in Massachusetts and Florida, with advanced training across multiple medical specialties, including Family Medicine, Dermatology, Gastrointestinal Health, Endocrinology, and Hormone Optimization. She takes an integrative, personalized approach to patient care, combining science-based methods with a focus on overall wellness.
Marni specializes in helping patients achieve optimal health through evidence-based treatments, including peptides, amino acids, regenerative therapies, and customized nutrition and lifestyle programs. She completed a fellowship in Anti-Aging and Metabolic Medicine (FAAMM) through the American Academy of Anti-Aging Medicine (A4M) and is certified by the American Board of Anti-Aging Health Practitioners (ABAAHP).
Dedicated to restoring balance and promoting longevity at the cellular level, Marni combines clinical expertise with compassionate care, empowering patients to feel vibrant, confident, and healthy throughout their lives.
Longevity Lab & Aesthetics
Success stories
Nurse Marni has been incredible! She’s been doing my injectables to perfection for years and most recently she’s been helping me with my weight loss journey. She’s also incorporated NAD therapy and peptide treatments for anti-aging and perimenopause symptoms — and the results have been amazing! My energy levels are up, my mood is more balanced, my inflammation is gone, and my skin looks noticeably more radiant. Marni takes the time to really listen, explain everything clearly and create a personalized plan that fits your specific needs. I truly feel like a better, younger version of myself thanks to her care. I highly recommend Marni to anyone looking to improve their health, confidence, and overall well-being!
There is no one better! I have been seeing Marni for years and wouldn’t trust anyone else with my skin, face or hormone health. From the beginning Marni takes a detailed look at all aspects of your lifestyle, aesthetic and health goals. I can confidently say that I look and feel my absolute best and all the credit goes to Marni.
I have been going to Marni for years for Botox and all things face/skin related. As a healthcare professional myself, I am very particular on who I go to. Marni is skilled, knowledgeable, thorough, and compassionate. She listens to the patient, but is also honest on what she thinks you need or don’t need. She never pushes unnecessary procedures. I recommend her to both family and friends without hesitation!
I have been seeing Marni for years for Botox and other injectables for facial balancing, she is truly talented with her craft and I only trust her with my face! If things couldn’t get better, Marni has helped me kick start my weight loss journey starting with a thorough consultation by discussing my goals and what was achievable in a healthy way. Since then I have lost over 20lbs and have never been more confident!
Mia Walsh
I’m a better, younger version of myself thanks to her care, which is why I am always comfortable referring friends or family to Marni for any services from from injectables to weight loss, NAD therapy and the like. She has a special level of insight and focus on results.
Andrew
Let’s connect
It can be challenging to start something new, but we are here to assist you. Feel free to contact us if you would like to learn more about a service, discuss treatment options, or get to know us better.
No pressure, no pushy sales, just kind, thoughtful guidance from a team that genuinely cares.