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Buy One Get One Free on All Products, Automatically Added to Your B.
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Buy One Get One Free on all products, automatically added to your basket for FREE.
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Verified 2nd Apr
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Current Promo Offers (April 2026)
£5 off on Your First Purchase when You Sign Up at Hairgain
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£5 off on your first purchase when you sign up at Hairgain. Only available for new customers.
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Verified 2nd Apr
Peptide Puff Dry Shampoo Product Launch
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Peptide Puff Dry Shampoo Product Launch.
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Verified 2nd Apr
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Free Shipping on All Orders
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Free shipping on all orders.
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Verified 2nd Apr
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Buy One Product Get the Same Product Free
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Buy one product get the same product free.
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Verified 2nd Apr
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FREE Silke Hair Bands when You Spend over £30
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FREE Silke Hair bands when you spend over £30.
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Verified 2nd Apr
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Claim 20 % off on subscription orders (to 1st Apr)
HAIR GAIN - BUY ONE GET ONE FREE - SUMMER SALE (to 31st Aug)
30 % off all single line items (to 2nd Jan)
30 % off all single line items AND 1 month free when you sign up for. (to 2nd Jan)
40 % off Leap Year Flash Sale - 48 hrs only (to 2nd Jan)
Free Mini Hair Mask on orders over £40 (to 2nd Jan)
25 % off Hair Gain Range for Valentines Day (excludes bundles, subsc. (to 2nd Jan)
30 % off all single line items with ode SPRING30 (to 2nd Jan)
50 % off all single line items and 15 % off bundles (to 2nd Jan)
25 % off Hair Growth Gummies (to 2nd Jan)
50 % OFF Peptide Puff Dry Shampoo and Selected Bundles at Hair Gain Coupon (to 12th Oct)
20 % off Single Line Products (to 20th Sep)
30 % off orders with code BDAY30 (to 20th Sep)
40 % Off Hair Gain Gummies, award winning vegan hair supplements. Th. (to 20th Sep)
Black Friday BOGOF sale across the whole Hair Gain range (to 20th Sep)
25 % off sitewide, no discount code required (to 20th Sep)
25 % off gummies and capsules (to 20th Sep)
40 % off everything except subscriptions and gift sets (to 20th Sep)
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