Cell culture supplement · BEGINNER LESSON
Fetal bovine serum
Fetal bovine serum (FBS) is a liquid supplement made from blood collected from bovine fetuses and added to cell culture media. It is measured by its ability to support cells in vitro, but its exact mixture of components is not fully known and can vary between batches.
What it is and what is measured
Fetal bovine serum is a supplement added to cell culture media, which are the liquids that keep cells alive and growing outside the body. In use, scientists do not measure FBS by one single ingredient; they measure whether it helps cells attach, survive, divide, and maintain their shape and function in vitro, meaning in a lab dish or flask. It is also valued for low antibody content and for supplying nutrients, growth factors, and hormones. [0,1,2]
[1] Alternatives for fetal bovine serum (FBS) and sustainability of milk ... [2] Review of the Current Research on Fetal Bovine Serum and the ... [3] Fetal bovine serum: how to leave it behind in the pursuit of ...
How it works
FBS supports cells because it contains a wide mix of proteins, carbohydrates, fats, vitamins, trace elements, hormones, cytokines, and growth factors. Albumin, a major protein in serum, can carry small molecules such as lipids and fatty acids and may help support cell growth and attachment. Because different cells need different signals, many cell types can extract useful substances from this diverse mixture. [0,1,2]
[1] Alternatives for fetal bovine serum (FBS) and sustainability of milk ... [2] Review of the Current Research on Fetal Bovine Serum and the ... [3] Fetal bovine serum: how to leave it behind in the pursuit of ...
Why scientists worry about it
A key limitation is that the exact composition of FBS is not fully identified, so different batches can behave differently. It may also contain endotoxins and microbial contaminants such as fungi, bacteria, viruses, and prions. In addition, FBS raises ethical concerns because it comes from bovine fetuses obtained during slaughter, and its cost and demand have increased. These issues make experiments harder to standardize and reproduce. [0,1,2]
[1] Alternatives for fetal bovine serum (FBS) and sustainability of milk ... [2] Review of the Current Research on Fetal Bovine Serum and the ... [3] Fetal bovine serum: how to leave it behind in the pursuit of ...
What researchers use instead
Scientists study substitutes such as adult bovine serum, porcine and bovine platelet lysates, bovine serum albumin, human platelet lysate, and chemically defined media. These alternatives can reduce some problems, but each has limits; for example, some may still vary between batches, may be costly, or may not fully replace all the functions of FBS. [0,2]
[1] Alternatives for fetal bovine serum (FBS) and sustainability of milk ... [3] Fetal bovine serum: how to leave it behind in the pursuit of ...
SEE THE IDEA
How FBS affects cell culture
Source material collected from the fetus before making serum.
Added to cells to supply mixed nutrients, proteins, and growth signals.
Cells may attach, survive, divide, or change form and gene activity.
Unknown composition, contamination risk, batch variation, cost, and ethics.
Source material is processed into a serum supplement, which can help cells grow but also introduces variability and other drawbacks.
FBS is a biologically rich but imperfect cell culture supplement.
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Sources and further reading
This general lesson was generated from public source material. It explains a concept; it does not interpret a private paper or provide medical advice.