Physiologix™ XF SR


A cGMP, xeno-free media supplement made for stem cells and T cells that replaces FBS or human serum.

$99 / 10 mL (Part Number: 320)
$990 / 100 mL (Part Number: 322)

See the latest research! We, along with our collaborators at the University of Pennsylvania, were recently published in the journal Molecular Therapy – Methods & Clinical Development. Physiologix demonstrated superior solid tumor cytotoxicity compared to cells grown in human serum. Read the full article here

Physiologix XF SR

Many “serum-free” supplements and complete media don’t disclose their origin or contents.

Our serum replacement is extracted from transfusion-grade blood products and comes with a full certificate of analysis.


Sample CoA Click to download

Nucleus Physiologix CofA


Physiologix data


Physiologix: Bringing Consistency to Cell Therapy Applications

Physiologix: Bringing Consistency to Cell Therapy Applications

The key to every successful therapy is consistency. Cell therapy manufacturers need solutions that allow them to efficiently harness the ability of a living cell to respond to its environment, while simultaneously delivering replicable and consistent quality...

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NB ROC T Cell Poster

Authors: Asma Ayari, Francisco J Martinez-Becerra, Yinan Tu, Yinan Lu, and Roddy O’Connor 

ROC T cells

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ISSCR 2019 Poster

Authors: Saba Ghassemi, David Heo, Francisco J. Martinez-Becerra, John Leferovich , Sarah Richman, Alyssa M. Master, and Roddy S. O’Connor


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Adoptive immunotherapy involves patient T cell expansion in optimal conditions for the purpose of re-infusing their progeny as therapy. This calls for the generation and characterization of novel media supplements and formulations to boost the progress of the cell therapy market by providing physiologically relevant protein sources in concentrations suitable for biological activity. Physiologix™ XF Human Growth Factor Concentrate (hGFC) is a cGMP, xeno-free serum replacement that replaces supplements such as fetal bovine serum (FBS) or human serum (HS). In this study, T cell media such as OpTmizer and X-VIVO 15 were supplemented with 5% human serum or 2% Physiologix™ XF. In addition, RPMI 1640 with 10% FBS was compared due to its prevalent use in non-clinical settings. T cells from three healthy donors were activated with CD3/CD28 Dynabeads and then cultured for 14 days in varying media formulations. Proliferative capacity was assessed with flow cytometry. Physiologix™ XF showed increased potency relative to human serum when used along X-VIVO 15 or OpTmizer media. Differentiation status was assessed using CCR7 and CD45RO to distinguish T cell subpopulations. We detected an increase in naïve and central memory populations when cells were cultured in Physiologix™ XF compared to human serum. These phenotypes are highly relevant for the outcome of patients undergoing CAR-T cell therapy. To further define the advantage of our supplement in generating therapy ready products, we compared the transduction efficiency of a lentiviral-GFP in OpTmizer, X-VIVO 15 or RPMI supplemented with 2% Physiologix™ XF or 5% HS at different multiplicities of infection (MOIs). A higher transduction efficiency was consistently observed when using Physiologix™ XF at a high MOI of 4 down to a MOI of <1. These results were also observed for anti-GD-2 and anti-EGFR virus. This increased transduction efficiency and preservation of T cell subpopulations can translate into a higher number of transfusable CAR+ cells with relevant phenotypes which allow for reduced overall costs and better clinical outcomes. The ability of anti-GD-2 CAR-T cells expanded in medium supplemented with Physiologix™ XF to directly kill target cells and control tumor burden in an aggressive leukemia xenograft model is discussed.

Our three product pillars to address your Xeno-Free needs



Streamlined Regulatory Compliance

  • Completely Xeno-Free
  • Processed under cGMP conditions
  • Transfusion-grade raw material

media cost


Lower Media Costs with Superior Yield

  • Superior proliferation in both T cells and stem cells
  • Lower acquisition cost and cost per target cell count



Consistent and

  • 2% recommended concentration in basal media (FBS requires 10%)
  • Documented consistency across lots