Biostimulators in Aesthetic Medspa Practice: An Expert Review

Biostimulators have emerged as a powerful category of injectable treatments in aesthetic medicine. Unlike traditional dermal fillers that simply replace lost volume, biostimulators leverage the body’s own regenerative pathways to induce collagen and elastin production, improving skin quality, firmness, and structure over time.

1. What Are Biostimulators?

Biostimulators are injectable agents designed to stimulate the body’s natural collagen-producing mechanisms rather than just filling space. When placed into the deep dermal or subdermal layers, they provoke a controlled biological response that leads to tissue remodeling, thicker dermis, and gradual volumization. 

Commonly Used:

• Poly-L-lactic Acid (PLLA): A biodegradable synthetic polymer that stimulates fibroblasts to generate new collagen over weeks to months (e.g., Sculptra®). 
• Calcium Hydroxyapatite (CaHA): A mineral naturally found in bone that offers immediate volume with long-term collagen induction (e.g., Radiesse®). 

2. Mechanism of Action: Collagen Induction, Not Immediate Fill

Biostimulators act via a two-phase process:

1. Immediate Structural Support (if applicable): Agents like CaHA provide an initial scaffold or volume correction. 
2. Biostimulation Phase: The presence of the biostimulator triggers fibroblast activity and controlled immune engagement, leading to gradual synthesis of collagen and elastin fibers. This remodeling improves skin thickness, elasticity, and long-term support. 
3. Clinical Applications in Medspa Settings

Biostimulators are particularly valuable for:

a. Facial Rejuvenation and Volume Restoration

They are indicated for areas of age-related volume loss (e.g., cheeks, temples, nasolabial folds) and deep wrinkles, offering natural, progressive improvement. 

b. Skin Quality Enhancement

By increasing dermal collagen and elastin, biostimulators can improve skin texture, elasticity, and thickness, a key goal in comprehensive anti-aging protocols. 

c. Body Areas and Larger Surface Treatments

Diluted techniques (e.g., hyper-diluted CaHA) are also used off-label for treating lax skin on the neck, arms, or abdomen, focusing more on skin tightening than volumization. 

4. Outcomes and Patient Satisfaction: outcomes as looking “refreshed” or “rejuvenated”

Clinical studies and systematic reviews indicate:

• High satisfaction rates (pooled satisfaction estimates around 90%). 
• Gradual, natural results that evolve over weeks to months instead of instant correction. 
• Durability: Some biostimulators like PLLA can last up to two years or more. 

References:

Sean M. Fisher, Zachary Borab, David Weir, Rod J. Rohrich, The emerging role of biostimulators as an adjunct in facial rejuvenation: A systematic review, Journal of Plastic, Reconstructive & Aesthetic Surgery,Volume 92, 2024, Pages 118-129, ISSN 1748-6815, https://doi.org/10.1016/j.bjps.2024.02.069.