This invention provides novel peptides that ameliorate one or more symptoms of atherosclerosis. The peptides typically range in length up to about 30 amino acids, comprise at least one class A amphipathic helix, and protect a phospholipid against oxidation by an oxidizing agent. The peptides are highly stable and readily administered via an oral route. The peptides are effective to stimulate the formation and cycling of pre-beta high density lipoprotein-like particles and/or to promote lipid transport and detoxification. In addition, the peptides inhibit osteoporosis. When administered with a statin, the peptides enhance the activity of the statin permitting the statin to be used at significantly lower dosages and/or cause the statins to be significantly more anti-inflammatory at any given dose.