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Official site, Amazon, and what each pack really costs once shipping is in.
Last Updated: August 29, 2026 · Reviewed by Dr. Sarah Kim, RDN
Two places: the Peak Biome website and Amazon. I'd buy from the website. The multi-jar prices are better, the 90-day refund applies in full, and you're dealing with the company directly if anything goes wrong. Amazon is fine if you want a single jar quickly, but check the price against the table below first.
Three packs on the official site. Note the shipping column, because it changes the real cost of the smaller ones:
The 6-jar pack is the one most people buy, and it's the only one where shipping is free. At about a dollar a day it's the cheapest way to take it, and it gives you six months, which is well past the point where the results have settled. If you're not sure, the 3-jar pack at $39.95 each is a fair trial; a single jar barely gets you past the adjustment week.
Yes, under the Peak Biome brand. Amazon pricing moves around and is usually worse on multi-jar packs, and the 90-day guarantee applies to purchases from the official site. Amazon's own return window is shorter. If you buy on Amazon, buy from the Peak Biome storefront, not a third-party seller.
There's no coupon code. The multi-jar discounts on the official site are the promotion, applied automatically. If a site offers you a "Peak BioBoost discount code", it's either a redirect to the same price or a scam.
Six jars ship free in the US. One and three jars add $9.95. Orders go out within a day or two. Every order has the 90-day money-back guarantee, and they accept empty jars, so there's no reason to hold back on trying it properly.