Brain Octane Oil: What Is It? And What Does It Do?

This is the stuff Jennifer Aniston adds to her coffees and smoothies so it's got to be good right? She's so enthusastic about the brand that she's become their Chief Creative Officer. The powder is available at Boots and also at Cult Beauty.

Founded by Jessica Sepel, a qualified nutritionist, JSHealth's offering is sustainably sourced marine collagen powder, derived from 100% pure cod skin. This type of collagen (categorised as type 1, for those in the know) is more effective than other collagen sources on the market (like bovine and porcine). Tried & Tested by Deputy Commercial Content Editor, Natalie Corner: "I've seen Rochelle Humes pop a 6g scoop of this in her green tea in the mornings and rave about how good it is. So I wanted to see what the fuss was about! Firstly great tip from Rochelle to add it to her green tea in the morning, as I prefer to drink something warm when I first get up and it adds a fruity kick. I tried it in cold water but it didn't seem to dissolve as easily and left a powdery aftertaste, however the best way to get your collagen boost is in porridge. Yum. After using it for almost a month I noticed less shedding of my hair, leaving it a little glossier and thicker. For my skin I noticed brightness and any slight scarring from pimples seemed to turn over a lot more quickly than usual. I'm going to continue taking it to see more results!"

Beauty Pie have put a lot of research into their collagen supplement. In a randomized, double-blind placebo, controlled and ex vivo study, a 10g daily dose (one scoop) increased skin moisture by 28% after 8 weeks and decreased collagen fragmentation by 31% after 12 weeks. That's a lot to take in but think plumper, dewier skin in the long run. It's pricey for non-members but if you're a Beauty Pie member already it's a no-brainer. Oh and the flavour? A hint of strawberry.

This is a vegan elixir that works to plump your skin whilst nourishing your gut too. With the delicious taste of wild berries, what's not to love?!

The Nue Co is changing up our approach to health with supplements that are easy to integrate into your health regime and have noticeable results. Like collagen, lipids begin to deplete as we age. The Nue Co.'s Skin Hydrator is excellent for prolonging your skin's equilibrium. This blend of hydrating hyaluronic acid, aloe vera and hydrolysed bovine collagen works to repair the skin's defences by locking in the moisture that helps strengthen its collagen framework - leaving you with radiant, glowing skin.

Bare Biology is considered one of the best producers of fish oil around, and it is stringent about avoiding any non-essential ingredients. In short, you know you're getting the good stuff.

'I take collagen but I think of it more as an all-round body helper as opposed to a skin-specific supplement. I like powder forms of collagen best. If you're a bone broth person, which is a great source of collagen, then great but when it comes to taking collagen every day I prefer to use a powder supplement. I like Puori Pure Collagen Peptides, £29.99. I do believe with things like collagen, be careful where you get it from get a really good quality one. There are vegan forms of collagen out there too.' - Rose Ferguson, Nutritionist.

The Dose & Co premium collagen collection is a supplement range founded by naturopath and nutritionist Libby Matthews and supported by business partner and spokesperson Khloé Kardashian. This unflavoured collagen powder is free from gluten, dairy, soy, preservatives, and artificial colours. Blend into coffees, tea, shakes, smoothies and other recipes.

As part of her collaboration with the London Aesthetics Company Gemma Collins has launched her very own collagen supplement. These marine collagen capsules are gluten and dairy-free. Take one capsule before bed each night with water.

Brain octane oil is an oil sourced purely from coconuts. It is flavourless which makes it perfect for adding to smoothies, drinks, salad dressings, you name it. It's different to regular coconut oil. Brain octane oil is made of only the fat in coconuts that boasts the highest amount of ketogenic energy. This fat is then purified and distilled into a versatile oil.