8,700 Studies Reviewed. 87.0% Found Biological Effects. The Evidence is Clear.
Shield Your Body
Cellular Effects

Effects of 900 MHz Radiofrequency Radiation on Skin Hydroxyproline Contents.

Bioeffects Seen

Cam ST, Seyhan N, Kavaklı C, Celikbıçak O. · 2014

View Original Abstract
Share:

Cell phone radiation below safety limits altered skin protein levels in rats, suggesting tissue stress responses occur at everyday exposure levels.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to cell phone radiation for 20 minutes daily over three weeks. They found increased hydroxyproline levels in skin tissue, indicating biological changes from electromagnetic exposure. The radiation levels were below current safety limits, suggesting legally compliant phone use may still affect skin.

Why This Matters

This study adds to mounting evidence that radiofrequency radiation affects biological systems at exposure levels regulators consider safe. The finding that GSM phone-like radiation altered hydroxyproline levels in skin tissue is particularly significant because hydroxyproline is a key marker of collagen metabolism and tissue remodeling. When hydroxyproline increases, it often signals the body is responding to stress or damage by rebuilding tissue structure. What makes this research especially relevant is that skin receives the highest radiation dose when you hold a phone to your head or carry it in your pocket. The SAR level used (1.35 W/kg) is well below the 2.0 W/kg limit in most countries, yet still produced measurable biological changes. This challenges the assumption that current safety standards adequately protect human health, particularly with chronic daily exposure that most of us experience.

Exposure Details

SAR
1.35 W/kg
Source/Device
900 MHz, pulsed with 217 Hz
Exposure Duration
20 min/day for 3 weeks

Exposure Context

This study used 1.35 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 1.35 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern rangeFCC limit is 1x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 217 Hz - 900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 217 Hz - 900 MHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

The present study aimed to investigate the possible effect of pulse-modulated radiofrequency radiation (RFR) on rat skin hydroxyproline content, since skin is the first target of external electromagnetic fields.

Skin hydroxyproline content was measured using liquid chromatography mass spectrometer method. Two m...

The data indicated that whole body exposure to a pulse-modulated RF radiation that is similar to tha...

Cite This Study
Cam ST, Seyhan N, Kavaklı C, Celikbıçak O. (2014). Effects of 900 MHz Radiofrequency Radiation on Skin Hydroxyproline Contents. Cell Biochem Biophys. 2014 Sep;70(1):643-9. doi: 10.1007/s12013-014-9968-6. PMID: 24760629.
Show BibTeX
@article{st_2014_effects_of_900_mhz_886,
  author = {Cam ST and Seyhan N and Kavaklı C and Celikbıçak O.},
  title = {Effects of 900 MHz Radiofrequency Radiation on Skin Hydroxyproline Contents.},
  year = {2014},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/24760629/},
}
PubMed: 24760629

Cited By (8 papers)

Quick Questions About This Study

Research shows cell phone radiation can cause biological changes in skin tissue. A 2014 study found that 900 MHz radiation increased hydroxyproline levels in rat skin after just 20 minutes of daily exposure, even at legally compliant power levels.
GSM phone radiation appears to alter skin biochemistry at the cellular level. Scientists found increased hydroxyproline concentrations in skin tissue after three weeks of exposure to pulse-modulated 900 MHz radiation similar to what cell phones emit.
Studies suggest 900 MHz radiation can trigger biological changes in skin cells. Researchers detected elevated hydroxyproline levels in skin tissue after exposure to this frequency, indicating cellular alterations even below current safety limits.
Cell phone radiation may alter skin protein levels and cellular processes. Research found that 900 MHz GSM-type signals increased hydroxyproline in skin tissue, suggesting biological effects occur even within current regulatory safety guidelines.
Radiofrequency radiation can change protein concentrations in skin tissue. A controlled study showed that 900 MHz pulse-modulated signals significantly increased hydroxyproline levels in rat skin after three weeks of 20-minute daily exposures.