I'm 51 with thinning hair and I use these products, currently on sale at Amazon

One big problem with fine, thin hair is that it's hard to find moisturizing, defrizzing products that won't make your strands look limp. Enter OGX's weightless dry oil spray, which helps smooth fly-aways, mend split ends and eliminate fuzzy, frizzy summer hair without it looking greasy or heavy.

"This oil is extremely lightweight, does not weigh down hair and the spray bottle projects the perfect amount in each spray," said one reviewer. "I have fine hair and it leaves it soft, not greasy, and there's no lack of volume... ."

File this silicone brush under "things you don't think you need until you try them." Regular scalp massages are one of the best and first steps you can take if you want to stimulate hair growth.

This brush makes it easy — just apply your shampoo or hair oil and go to town in circular motions for a minute or two. Not only will you be helping unclog pores on your scalp and improve circulation, but the whole process feels amazing.

Grab the doodad while it's nearly 50% off.

This lightweight, scalp-health-boosting spray was developed with the help of dermatologists to bring volume, bounce and lift to even the thinnest hair.

It's formulated with vitamins B and E, plus nourishing peptides to texturize hair at the roots without making it crunchy or dry like similar treatments. The result is soft, silky, fuller locks — for under $10.   

"I was looking for a product with root lift that didn't make my scalp itchy or sticky," said a fan. "This is a very good product. Smells nice. It also doesn't make my hair greasy, so I can go a couple of days without washing. I don't need extra product each day either."

It seems like hooey, but it's actually true: Topically applied rosemary oil has been clinically proven to initiate new hair growth and help prevent further loss. In fact, a 2015 study suggests that rosemary essential oil is as effective as minoxidil at growing new hair in mice.

This is an excellent rosemary oil should you want to try it out: Mielle Organics' formula contains follicle-stimulating biotin, and it's color-safe. It's also paraben-free, highly concentrated — and an Amazon best seller with nearly 70,000 five-star reviews.

Some forms of hair loss can be caused by product buildup on the scalp and, if your hair is both shedding and looking dull, Neutrogena's Healthy Scalp shampoo may offer relief. It's non-medicated, color safe and sulfate free and, while the formula is strong enough to dissolve built-up gunk on your scalp and strands, it's not too harsh to be used occasionally on fine or thinning hair.

Best of all is the grapefruit scent, which is citrus-y and fresh but not at all sweet.

Boldify's Hairline Powder is not only one of our best gray roots touch-up products of the year, it's also quite good for filling in a sparse hairline. If you have silver roots and you're suffering from thinning hair, this might just be your ticket. It's not as harsh as some of the spray formulations and it's easy to wash out — all of which is crucial for maintaining fine, thinning hair and helping stave off additional shedding.

The shade range here is impressive — there are 14 to choose from, including three blonde. There's even a silver option, if you're interested in maintaining your grays while filling in patchiness and making your coif look more robust. Last surprise bonus: The powder works a bit as a dry shampoo to absorb excess oil so you can shampoo less.

At first glance you might think: Why in the world would I need a silk pillowcase? AM I AN EMPRESS? Are we in Hollywood in 1934? Should I start sleeping in a face of cold cream and calling people dah-ling? Do I need a silk robe and high-heeled slippers too?

But then you learn the facts: Silk pillowcases support the health of both skin AND your hair. Research shows they can help prevent shedding and breakage and can keep your hair from frizzing overnight, leading to less styling and an overall healthier mane.

There's so much to love about this thickening, moisturizing, salon-quality shampoo and conditioner duo. For starters, it contains zero harsh chemicals. It's safe for all hair types (including color-treated) and it's not tested on animals. But the ingredients are the true stars here: Biotin, vitamin B and caffeine are all proven to nourish fine hair follicles and help stimulate growth. 

With 11,000 five-star reviews, this popular set is a steal at 20% off. "My hair has never felt so good," said one reviewer. "My hair is thin but this does not weigh it down. I also notice a lot less hair loss in my brush and styling tools."

For more options, check out our roundup of the best shampoos for thinning hair.

A rare sale! Nioxin's award-winning hair treatment works for thinning locks on several levels, providing moisture and strengthening the strands to help thwart breakage while deeply cleansing the scalp of follicle-cloggers like sebum and other oils. It comes in numerous levels, starting at Level 1 and going through 4, depending on the severity of your thinning.  

The products are wildly popular, with Alyssa Milano praising their effectiveness and more than 7,000 five-star Amazon reviewers waxing poetic.

"Perfect for women with thinning hair!" exclaims one enthusiastic user. "I’ve tried everything once my hair started to thin as I got older, and nothing has worked until I found this hair system. A friend of mine asked me what I used and now she is using it and seeing [results] with her hair..."

Another major deal alert! This top-selling hair treatment is a favorite of celebs (including Nicole Kidman) and we can see why: The wildly popular serum promises to promote growth and improve the appearance of thinning hair, leaving it looking thicker and fuller.

"After six weeks of usage, I can tell a notable difference in the amount of hair I am shedding as well as a visible increase in my hair density," said one user. "I have a long way to go, but I am loving the results I am seeing now."

This bundle includes the best-selling serum along with a 30-day supply of Vegamour's potent hair vitamins, which are made with biotin along with vitamins A, C, E and B-12 to support the production of hair-growth-promoting keratin and collagen.