These supplements thickened my thinning hair—and they’re on sale for October Prime Day

A few years ago I started to notice my ponytail felt so much thinner than usual. I’d had a stressful few years, and hair loss had become a disturbing side effect. The doctor later confirmed that the culprit was hormonal fluctuations—mine were caused by stress, but women lose their hair to everything from genetics to perimenopause.

So I started trying every supplement I could, including vitamin D and collagen. Within months, my hair started to thicken and my overall health improved. Lucky for me, Amazon carries the exact supplements I take by the Sports Research Store and they are part of the great deals for the Prime Day Early Access sale. Of course, you need to be an Amazon Prime member to take advantage of these deals. Here's how you can sign up for a free trial, which also gives you complimentary shipping.

Collagen Peptides Powder

Collagen Powder Supplement

$21$35Save $14

A good way to naturally strengthen tendons, ligaments, skin and hair, Sports Research Store’s Collagen Peptides Powder is all-natural and GMO-free.

$21 at Sports Research

Vitamin D3 5000iu (125mcg) with Coconut Oil

$10$25Save $15

This Vitamin D3 delivers the same form of vitamin D that is produced in the body from direct sunlight without the risk of unprotected UVA and UVB exposure.

$10 at Sports Research

Turmeric Curcumin C3 Complex 500mg

$21$33Save $12

Sports Research Turmeric is free of preservatives, fillers, artificial colorings, and soy, plus it's non-GMO certified.

$21 at Sports Research

Our bodies produce collagen naturally to strengthen tendons, ligaments, and skin. Collagen also provides the amino acids necessary to build keratin, which is what hair is made up of. After a lot of research, I settled on Sports Research Store’s Collagen Peptides Powder, which has more than 97,000 (!!) five-star reviews and is on sale for just $21. It has the all-important hydrolyzed type I and III collagen and is all-natural and GMO-free.

As a bonus, it does wonders for joints, too, and it’s seemed to help heal a herniated disc in my spine recently—I’m finally pain-free now. I’ve tried other collagen peptide powders—namely this one by Orgain—but only Sports Research Store’s Collagen Peptides Powder dissolves so well into my morning coffee it disappears, never clumps. And it’s totally taste- and texture-free.

Vitamin D3

Did you know that more than 40 percent of adults are deficient in Vitamin D—and that number jumps as high as 82 percent in certain racial and ethnic groups? The National Institutes of Health calls it “an ignored epidemic,” and it’s been linked to everything from depression to back pain (and yes, hair loss, too).

I found all of this out when I had a thyroid panel done several years ago, and my doctor was shocked to see how low my vitamin D levels were (it’s never a good feeling to shock a doctor!). After taking prescription-strength vitamin D for a month, I now maintain with Sports Research Center Vitamin D3, which contains coconut oil for absorption—it’s more than 50 percent off during Prime Day. It’s a pretty safe dosage for the average person but definitely consult with your doctor about what vitamin D dosage is right for you.

Turmeric

I also take turmeric. When I herniated my L5/S1 spinal disc, I was desperate for natural remedies. My research led me to turmeric supplements, and my pain management doctor confirmed that turmeric is an effective anti-inflammatory—great for any type of inflammation, in fact.

A friend with a similar issue told me to make sure the turmeric supplement I took contained the active component curcumin, which studies show is a powerful anti-inflammatory. I decided to stick with Sports Research Store, and now I take their Turmeric Circumin C3 Complex supplement—500 mg once a day. Their formulation has coconut oil, so it absorbs better.

See all of our Prime Early Access Sale coverage, here. Shop the top early Prime Day deals on Yahoo Life, get the best Prime Day tech advice on Engadget, learn about Prime Day trends on In the Know, and check out Prime Day car deals on Autoblog.