Sodium Alginate

Alginate Compare

Find the cheapest raft-forming antacid available in the US — sorted by cost per dose.

What is sodium alginate? It's a seaweed-derived ingredient that forms a floating gel "raft" on top of stomach contents when it contacts acid — physically blocking reflux rather than just neutralizing it. It works differently from calcium carbonate or proton pump inhibitors.

Why isn't this at CVS? The Gaviscon sold in US pharmacies uses aluminum and magnesium hydroxide — not sodium alginate. The UK formulation does. The products below are US-made sodium alginate brands and UK Gaviscon imports available on Amazon.

11 products

Product↕	Form	Alginate/dose↕	Sodium/dose↕	Price↕	Doses↕	$/dose↑	Buy
Gaviscon Advance Liquid ("Gav") 500ml x 2 pack UK import Weird: On Amazon this is available but they are hiding the Gaviscon name and the bottle design looks like medical supply and not retail	liquid 5 ml / 1 tsp	500mg	58mg	$67.00	200	$0.34 Best value	Amazon →
	liquid 5 ml / 1 tsp	500mg	58mg	$67.00	200	$0.68	British Essentials ↗
Gaviscon Advance Liquid ("Gav") 500ml UK import Weird: On Amazon this is available but they are hiding the Gaviscon name and the bottle design looks like medical supply and not retail	liquid 5 ml / 1 tsp	500mg	58mg	$36.00	100	$0.36	Amazon →
	liquid 5 ml / 1 tsp	500mg	58mg	$36.00	100	$0.68	British Essentials ↗
Gaviscon Advance Chewable 120 tablets (2-pack) UK import These get really gummy when chewing	tablet 1 tablet	500mg	53mg	$50.00	120	$0.42	Amazon →
Gaviscon Advance Chewable 60 tablets UK import These get really gummy when chewing	tablet 1 tablet	500mg	53mg	$30.00	60	$0.50	Amazon →
Reflux Gourmet 8 oz US	liquid 5 ml / 1 tsp	425mg	28mg	$28.00	47	$0.60	Amazon →
Reflux Gourmet 8 oz US	liquid 5 ml / 1 tsp	425mg	28mg	$28.00	47	$0.60	Reflux Gourmet ↗
Reflux Raft 8 oz US Discount with subscription	liquid 5 ml / 1 tsp	338mg	28mg	$33.00	47	$0.70	Amazon →
Reflux Raft 8 oz US Discount with subscription	liquid 5 ml / 1 tsp	338mg	28mg	$33.00	47	$0.70	Reflux Raft ↗
Refluxter 60 capsules US	tablet 2 capsules	1000mg	150mg	$30.00	30	$1.00	Amazon →
Refluxter 60 capsules US	tablet 2 capsules	1000mg	150mg	$30.00	30	$0.90	Nutritist ↗
Gaviscon Double Action Liquid 150ml x 2 pack UK import Pink bottle	liquid 10 ml / 2 tsp	500mg	127mg	$34.00	30	$1.13	Amazon →
	liquid 10 ml / 2 tsp	500mg	127mg	$34.00	30	$2.06	British Essentials ↗
Reflux Gourmet 25 single-serve packs US	liquid 5 ml / 1 tsp	425mg	28mg	$32.00	25	$1.28	Amazon →
Reflux Gourmet 25 single-serve packs US	liquid 5 ml / 1 tsp	425mg	28mg	$32.00	25	$1.28	Reflux Gourmet ↗
HartSpan Khelp 60 capsules US Newest on market? Discount with subscription	tablet 2 capsules	950mg	190mg	$54.00	30	$1.80	Amazon →
	tablet 2 capsules	950mg	190mg	$54.00	30	$1.80	HartSpan ↗
Gaviscon Double Action Tablets 24 tablets UK import	tablet 2 tablets	500mg	106mg	$27.00	12	$2.25	Amazon →

Research & Resources

Articles, links, and resources on sodium alginate and acid reflux.

1 items

External ↗

Research: Gaviscon Double Action alginate-antacid combo worked best

A 2017 study comparing alginate antacid products head-to-head found that not all alginate formulas work equally well — the quality of the formula matters as much as the amount of alginate. Gaviscon Double Action came out on top (note: the study was funded by its maker, Reckitt Benckiser).

Aug 17, 2017