Caulking, Adhesives and Drywall Compound

Glue

Many water-based glues are marketed as "non-toxic," like Gorilla Glue or Titebond, for example, but still contain additives like Polyvinyl Chloride, Formaldehyde resin and 2- (2-butoxyethoxy) ethanol. The FDA-approval of "non-toxic" pertains to the final cured product, not the glue in the liquid state. Titebond II and III are commonly used to glue together cuttings boards.

I suggest wearing gloves when handling these glues, as their solvents pass readily through the skin.

Pure Hide glue is derived from animal skin, bones and tendons. It is probably the safest option available. Since it is water soluble, it should only be used on interior projects where it won't be exposed to excessive moisture.

AFM Safecoat makes a solvent-free adhesive called Almighty Adhesive.

Caulk

From what I have read, some caulks that contain harmful solvents are well-tolerated by MCS folks after the caulk has cured. For example, GE 100% Silicone Caulk, after it dries, is reportedly well tolerated by some with MCS. I would like to add that 100% silicone caulk is generally not preferred by experienced contractors, at least for wood-to-wood joints. Silicone is best used for metal and glass joints. In my experience with GE silicone caulk, the solvents used are extremely aromatic and noxious (during application). I find most acrylic or latex-based caulks (such as DAP or Big Stretch) much less pungent during their application and equally odorless after a few days of curing.

I prefer using AFM Safecoat caulking compound.

Drywall/Joint Compound

Here's some good information about joint compounds: Green Home Guide - Joint Compound.

Murco Wall Products make a hypo-allergenic compound called Murco 100. I used it with the MgO boards in my house, but there has been some minor cracking. I've talked to others who have used this product and they have cracking, too. Murco 100 would probably best be used as a thin, final coat over a different drywall mud.

Keim makes a mineral-based drywall compound called Dolomitspachtel. Also, consider their Universalputz Fine.

Push Design finishes their magnum board and ceiling panels with a magnesium powder + 200-300 grit sand + water mixture. This combination replaces the typical drywall compound. It is non-toxic, mold proof, water proof and breathable. I do not have experience with it and cannot attest to its durability in terms of cracking. I've asked Push Design repeatedly for the proportions they use in their drywall mix but have never received a reply...