HydroPeptide Launches Syner-C+ in Australia: 20% Ethyl Ascorbic Acid With Tranexamic Acid

HydroPeptide, a professional skincare brand based in Washington State in the US, has launched its Syner-C+ Multi-Action Brightening Serum in Australia. Its exclusive Australian distributor, Professional Beauty Solutions, announced the launch for September 2026 in a post aimed at clinics, and HydroPeptide's Australian store now lists the serum as new.

The vitamin C here is 3-O-ethyl ascorbic acid, a modified form of vitamin C that is more stable in a bottle than plain L-ascorbic acid. The distributor gives its strength as 20%. The serum also contains tranexamic acid, niacinamide and arbutin, three ingredients often used against pigmentation, but no percentages are given for them. HydroPeptide adds its own peptide delivery system, which it calls Micellar CellRenew-16.

The brand's pitch is that each ingredient tackles a different step of pigmentation. In its description, vitamin C and arbutin slow pigment production, tranexamic acid calms the signals that trigger it, and niacinamide limits how pigment moves into skin cells. These are the brand's claims, not tested results for this product. The serum is pitched at moderate to visible pigmentation and at ageing skin, and as a stronger option than HydroPeptide's earlier LumaPro-C serum.

The distributor cites a 12-week clinical study of 25 people, reporting gains of 27% in skin tone evenness, 29% in brightness and 31% in clarity. It does not say who ran the study, whether there was a comparison group, or how these measures were scored, so the figures are best read as marketing.

The serum comes in a 30 ml retail bottle and a 59 ml professional size. HydroPeptide's Australian site lists it at 259.95 Australian dollars. We found no Indian listing, so it is not part of our price comparisons. For an explanation of what tranexamic acid adds to a vitamin C serum, see our guide on the blog.