2. Tantric Sex

Sexual healing releases energy and improves intimacy, advocates say. But accusations of abuse and cultural appropriation have dogged the practice.

3. Bulking Up with Breast Milk

Bodybuilding is just one reason why some adults are pumped to drink so-called "liquid gold." Yet is breast milk sharing considered safe — or ethical?

4. Fasting

Fasting has vaulted beyond weight loss as biohackers have used it to optimize body and mind and enhance healing. But the practice holds real dangers.

5. Ayahuasca

Once reserved for Indigenous shamans, this powerful hallucinogen draws those hoping to unlock trauma and quell addiction. Can it also cause psychosis?

6. Bee Sting Therapy

Expensive and labor-intensive bee venom promises to soften wrinkles and treat chronic Lyme disease. But do the risks outweigh the rewards?