This invention is directed to use of certain peptide analogs comprising multiple amphipathic helical domains that are able to promote cellular lipid efflux and stimulate lipoprotein lipase activity. As a result, administration of invention peptides lead to reduced incidences of hypertriglyceridemia without inducing toxicity. Existing peptides that stimulate efflux of lipids from cells exhibit unacceptably high toxicity. Invention peptides are superior to existing peptides and can also be used to treat or prevent a vast range of vascular diseases, and their dyslipidemic precursors. Exemplary vascular diseases and conditions that could benefit from treatment with the invention peptides include: dyslipidemia, hyperlipidemia, hypercholesterolemia, HDL deficiency, coronary heart disease, atherosclerosis, and thrombic stroke.