Kinvara Hyaluronic Youth Boost (15ml). Kinvara Skincare Stockists. Kinvara Hyaluronic Youth Boost is a powerful fragrance free gel that combines the proven plumping action of Hyaluronic acid and the superfood properties of Turmeric, to help minimise and soften fine lines.. Add Hyaluronic Youth Boost to your skincare routine to help target signs of aging, especially at the mouth and brow areas.