Mainly because Urth Skin serums contain Vitamin C.
Vitamin C must be stored in dark glass in order to help protect it from exposure to light which breaks down the product.
Dark glass is vital for protecting vitamins and acids in serums due to their vulnerability to light and oxygen
1 x Tribe Trio Skin Serums + 1 x Inside Out Beauty Collagen Peptides 250grams TIN 
1 x Tribe Trio Skin Serums + 1 x Keipa Wash Kloth 
3 x refillable Eco Pouches 
1 x Heal & Protect 30ml Skin Serum + 1x Inside Out Beauty Collagen Peptides 250grams TIN 
1 x Dark to Light 30ml Skin Serum + 1x Inside Out Beauty Collagen Peptides 250grams TIN 
I cannot thank you enough for the post. Much thanks again. Really Great. Anni Raven
We are so glad you are enjoying it, thank you