Jul 2017;232(7):1681-1688
And each test must be performed on people of varying ages (18+), sexes, and skin types.5 In contrast, our picks from The Ordinary, INNBEAUTY Project, and NIOD may have gone through clinical testing, but the safety results are unknown
It also does not mean stronger is always better

IGF Analogues Product Qty in Cart Quantity Price Subtotal Human LR3 IGF-I (Receptor Grade) | BU020/BU100 $561.60 - $763.20Human LR3 IGF-I (Receptor Grade) | BU020/BU100 | GroPep Bioreagents678-BU020/678-BU100$561.60 - $763.20Qty in Cart: 0Quantity:Price:$561.60 - $763.20Subtotal: Human LR3 IGF-I (Media Grade) | AM001/AM010 $1,000.80 - $2,925.00Human LR3 IGF-I (Media Grade) | AM001/AM010 | GroPep Bioreagents678-AM001/678-AM010$1,000.80 - $2,925.00Qty in Cart: 0Quantity:Price:$1,000.80 - $2,925.00Subtotal: Human Des [1-6] IGF-II | MU100 $561.60Human Des [1-6] IGF-II | MU100 | GroPep Bioreagents678-MU100$561.60Qty in Cart: 0Quantity:Price:$561.60Subtotal: Human Des [1-3] IGF-I | DU100/DM001 $561.60 - $2,376.00Human Des [1-3] IGF-I | DU100/DM001 | GroPep Bioreagents678-DU100/678-DM001$561.60 - $2,376.00Qty in Cart: 0Quantity:Price:$561.60 - $2,376.00Subtotal: Human [Leu60] IGF-I | ABU100 $561.60Human [Leu60] IGF-I | ABU100 | GroPep Bioreagents678-ABU100$561.60Qty in Cart: 0Quantity:Price:$561.60Subtotal: Human [Leu27]IGF-II | TU100 $561.60Human [Leu27]IGF-II | TU100 | GroPep Bioreagents678-TU100$561.60Qty in Cart: 0Quantity:Price:$561.60Subtotal: Human [Leu24] IGF-I | ZU100 $561.60Human [Leu24] IGF-I | ZU100 | GroPep Bioreagents678-ZU100$561.60Qty in Cart: 0Quantity:Price:$561.60Subtotal: Human [Leu24] [Ala31] IGF-I | ADU020 $561.60Human [Leu24] [Ala31] IGF-I | ADU020 | GroPep Bioreagents678-ADU020$561.60Qty in Cart: 0Quantity:Price:$561.60Subtotal: Human [Arg6] IGF-II | GU020 $561.60Human [Arg6] IGF-II | GU020 | GroPep Bioreagents678-GU020$561.60Qty in Cart: 0Quantity:Price:$561.60Subtotal: Human [Arg3] IGF-I (Receptor Grade) | EU100/EM001 $662.40 - $2,376.00Human [Arg3] IGF-I (Receptor Grade) | EU100/EM001 | GroPep Bioreagents678-EU100/678-EM001$662.40 - $2,376.00Qty in Cart: 0Quantity:Price:$662.40 - $2,376.00Subtotal: Human [Arg3] IGF-I (Media Grade) | LU100/LM001/LM005 $561.60 - $3,384.00Human [Arg3] IGF-I (Media Grade) | LU100/LM001/LM005 | GroPep Bioreagents678-LU100/678-LM001/678-LM005$561.60 - $3,384.00Qty in Cart: 0Quantity:Price:$561.60 - $3,384.00Subtotal: Human [Ala31] IGF-I | AIU100 $561.60Human [Ala31] IGF-I | AIU100 | GroPep Bioreagents678-AIU100$561.60Qty in Cart: 0Quantity:Price:$561.60Subtotal: Human [Ala31] [Leu60] IGF-I | ALU100 $561.60Human [Ala31] [Leu60] IGF-I | ALU100 | GroPep Bioreagents678-ALU100$561.60Qty in Cart: 0Quantity:Price:$561.60Subtotal:

This depends on your health needs