Is it a fact that peppermint oil and lavanda oil in shampoo and conditioner causes moobs?

Gynecomastia: 'Moobs' - man boobs or gynecomastia in males has been reported in prepubertal males wi topical use of products containing lavender oil &/or tea tree oil. I don't know of any association between peppermint oil and gynecomastia. See: http://www.nih.gov/news/pr/jan2007/niehs-31.htm

Dr Raff and another doctor agreed

Highly unlikely: In a man of 79 years of age there are other causes of gynecomastia. Hormonal changes, benign or malignant, sometimes self inflicted may be the primary cause. Weight gain is another important factor. Visit you family doc and discuss your concerns. Good luck from nYC