A study reported that the conventional method of searching follicular fluid didn’t find all the eggs. The new technology found extra eggs more than half the time.

A federal law taking effect in November severely limits the amount of THC, the euphoric cannabis compound, allowed in over-the-counter items. Many groups are fighting back.

Videos aimed at pets are drawing millions of views. But who’s actually watching?

The states, all led by Democrats, claim the cuts were intended as retribution and will harm efforts to control H.I.V. and other sexually transmitted infections.

The country’s confirmed cases have topped 9,000 since last year, raising fears that a high-stakes evaluation in April could lead to its status being revoked.

The F.D.A.’s refusal to examine the company’s mRNA shot drew widespread criticism from doctors and was divisive within the agency.

A novel lawsuit in Portland argues the chemicals are a health threat that have soaked into apartment walls, furniture and even children’s toys.

Fringe movements are using games and other online platforms to draw growing numbers of children to their causes, new data and dozens of interviews show.

Struggling to sleep in strange places? New research might have finally found the answer to why it is difficult, even when tired.

The vaccine maker said the U.S. regulator rejected its request to seek approval for a new product using mRNA technology, which Health Secretary Robert F. Kennedy Jr. has sharply criticized.

Explaining why officials dropped limits, Dr. Mehmet Oz said alcohol “brings people together.” But social drinking also can lead to health problems, studies show.