Mayo Clinic didn't say that COVID-19 vaccines consist of chemicals promoting infertility and no COVID-19 vaccine has been approved for widespread use.
The vaccines undergoing clinical trials are being monitored and listed by the World Health Organization (WHO). None of the vaccines listed have yet been approved for use. In the most advanced (Third phase) human trials tracked by WHO, none of the potential vaccines differentiate between male and female test subjects. Despite this, there are recommendations for further research on this topic. Moreover, a Russian institute Gamaleya approved its own vaccine, but it has not undergone clinical trials and is unlikely to be used in the United Kingdom before it passes such a stage.
Therefore, it is false to say that a COVID-19 vaccine has gender-specific side effects, especially when no vaccine has been approved for widespread use yet.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.