Steel Flow Pro carries a 60-day money-back guarantee from the date of purchase.
The guarantee runs for 60 days from purchase and covers dissatisfaction with your results or your overall experience. That window is intended to cover a meaningful portion of the 90-day evaluation period the manufacturer recommends.
Contact the official store directly with your order number, within the 60-day window. Some guarantee programmes require unused or empty bottles to be returned; confirm what applies to your order before shipping anything back.