New York: Placenta face mask, which uses stem cells from a sheep's placenta to boost collagen and tighten skin, has emerged as the most preferred anti-aging treatments for British women aged 30 and over, a new survey has revealed.

The website, surveyed 2,173 British women aged 30 and over, and asked them about the unusual treatments that they were willing to try if provided for free.

Placenta face mask, topped the popularity poll, closely followed by bee venom and vampire facials, which uses patient's own blood to create a platelet-rich plasma, which is then applied to the face.

Top ten unusual anti-aging treatments:

1. Placenta face masks - 45 percent

2. Bee venom - 41 percent

3. Vampire face masks - 39 percent

4. Leeches - 38 percent

5. Sperm facial- 30 percent

6. Bird poo facial - 25 percent

7. Cryotherapy treatment - 21 percent

8. Cactus massage - 19 percent

9. Urine therapy - 15 percent

10.Solid gold facial - 14 percent