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.

explore our services

Embrace your skin with confidence. Find out which services can help you achieve your goals.

Lab and Devices

Reveal smoother, clearer, more even-toned skin using gentle light and laser therapies designed for visible yet natural-looking results.

Skin Health

Experience customized facials, microneedling, and skin-rejuvenation treatments that leave you glowing from the inside out.

Injectables

By using Botox and dermal fillers, you can smooth fine lines and add subtle volume where needed, always keeping your results natural-looking and refreshed.

Regenerative Treatments

Explore wellness options, including PRP, Hyper-diluted collagen biostimulators, and Renuva that support cellular healing and healthy aging.

Skin Concerns

Treat conditions like acne, dark spots, uneven skin tone, and texture changes with advanced therapies that gently and effectively care for your skin.

Wellness

Personalized programs that focus on restoring energy, balancing hormones, improving sleep, and supporting long-term wellness.

Longevity Lab & Aesthetics

experience the Difference

patient special

Our patient specials are here to guide, inspire, and introduce you to some of the many ways we support your health and aesthetics.

Weight Loss InBody Scan

Through advanced body scan technology, we create personalized weight loss plans that track your progress and keep you on track.

Chemical Peels

Boost your skin’s texture, tone, and clarity with targeted peels that brighten, exfoliate, and enhance its appearance.

Botox and Dysport

With proven injectable treatments, you can soften dynamic lines and prevent deeper wrinkles. Our approach is subtle, supportive, and always tailored to your natural features.

Filler

Dermal fillers can soften smile lines or add volume to cheeks without changing who you are.

PRP & PRF

These advanced treatments use your own blood’s natural healing factors to improve skin tone, encourage collagen production, and support healthy repair over time.

Compassionate. Experienced. Patient-Centered Care.

meet our founder

We offer functional medicine, aesthetic treatments, dermatology, and wellness care. We are more than a service provider; we are a partner on your journey.

We provide clear communication, honest advice, and treatment options tailored to your needs. Throughout your treatment plan, we’ll answer your questions, adjust your plan as needed, and ensure you feel informed and empowered.

Nurse Marni FNP-C

Founder & CEO, Longevity Lab & Aesthetics

Nurse Marni FNP-C

Founder & CEO, Longevity Lab & Aesthetics

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!

Sarah Morin

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.

Emily Phares

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!

Johanna Lam

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

TAKE THE FIRST STEP

Healthy, confident skin starts with the right aesthetic approach. Our team creates personalized treatment plans focused on long-term skin health and natural results, helping you feel confident inside and out for years to come. Schedule your consultation to begin your longevity-focused aesthetic journey.

617-413-6899

Schedule A Consultation

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.