‘The proof is in your drain,’ says Amazon shopper of biotin duo that ‘stopped hair from shedding’ – and it’s 20% off

A HAIR product has shoppers gushing over its nourishing effects on tresses.

One even said the proof of the beauty product working is in the shower drain itself.

The Pura D'or Anti-Thinning Biotin Hair Regrowth Shampoo and Conditioner Original Gold Label Set, $31.99 on sale, is available on Amazon.

The shampoo and conditioner set is based with organic ingredients, including "organic argan oil, tea tree oil, saw palmetto, nettle extract, [and] rosemary oil."

HOW IT WORKS

The shampoo contains scalp-nourishing ingredients to promote hair growth.

The conditioner also prevents hair breakage, allowing tresses to grow to their fullest potential.

With scalp health being essential for longer locks, the product boasts stronger strands.

The set is not only organic-ingredient based, it is also cruelty-free.

SHOPPERS SPEAK OUT

Several users of the product gave their take on how the product affected their hair.

"The measure of truth," one wrote.

"I noticed that my hair was thinning and I have always had a good thick head of hair.

"I have been using this product for around four months. The first month I cleaned out the shower drain and as usual it was full.

"Then after two months use the drain had half as much hair. I added the conditioner the second month and that was the game changer.

"So for the best performance use both products and as the directions state, leave it on your hair for a good two minutes for the best results.

"Well, I’m not sure that it is growing more hair but the measure of truth is in my drain.

"My hair is full of body and my shower drain has much less accumulation of hair.

"This product has stopped my hair from shedding. The proof is in your drain. It’s that simple. I have added the conditioner, with my usage every three days.

"I had been using grocery store brands only for all my life. The chemicals in those products were literally killing my hair.

"I have great confidence in this product’s ability to stop the damage.

"Money well spent, so get off your pocketbook and know that you can’t afford not to spend the extra money."