We chatted with celebrity hair colourist Justin Anderson recently, responsible for the hair hues of Jennifer Aniston, Gwyneth Paltrow and Margot Robbie (to name a few). As you've probably guessed, his forte is blonde - a high-maintenance hair colour that requires plenty of upkeep.

One of Justin's main clients is actress Margot Robbie, who he clearly loves working with:

"Margot’s really, really fun to collaborate with. She works on a lot of amazing projects and her style is always so great," he told us. "She’s really open to taking on a lot of changes. We’ve done a lot of different hair colours over the years."

But with constant colour changes and daily heat styling comes inevitable damage, and Justin has some solid-gold advice for clients who want to repair and nourish their colour-treated tresses, especially if they're wearing a wig on set:

"The great thing about Suicide Squad is Margot's hair was a wig, so we put either Olaplex or dpHUE oil in her hair, and she would alternate between the products to keep her hair really, really healthy under the wig."

Olaplex No.3 Hair Perfector 100ml

Olaplex No.3 Hair Perfector 100ml
Now 20% Off
Credit: Courtesy of Brand

Olaplex's bond-strengthening treatments work by going deep into the hair strand (rather than remaining on the surface of your hair), meaning the treatment is reparative rather than just shine-enhancing. And the brand just dropped it's strongest at-home treatment yet, scientifically proven to encourage 68% more repair. Available at Space NK and Feel Unique, Olaplex No.0 can currently be bought as part of a kit, also featuring the No.3 Hair Protector.

dpHUE Color Fresh Argan Oil Therapy

Color Fresh Argan Oil Therapy
Credit: Courtesy of Brand

The dpHUE is actually Justin's own brand of colour-focused haircare. It's not available to buy in the UK at the moment, so duties and VAT are reflected in the price.

The good news is, you don't have to be a wig-wearing actress to benefit from these products, PHEW!

To read more celebrity beauty insights like this, check out Inside The Beauty Squad, a feature in the October issue of Cosmopolitan Magazine, OUT NOW!

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Cassie Powney
Beauty Editor
Cassie Powney, Beauty Editor